Skip to main content

Gleb Finkelstein

Professor of Physics
Physics
Box 90305, Durham, NC 27708-0305
093 Physics, Science Drive, Durham, NC 27708

Selected Publications


Loss and Decoherence at the Quantum Hall-Superconductor Interface.

Journal Article Physical review letters · October 2023 We perform a systematic study of Andreev conversion at the interface between a superconductor and graphene in the quantum Hall (QH) regime. We find that the probability of Andreev conversion from electrons to holes follows an unexpected but clear trend: th ... Full text Open Access Cite

Nonreciprocal Supercurrents in a Field-Free Graphene Josephson Triode.

Journal Article Nano letters · June 2023 Superconducting diodes are proposed nonreciprocal circuit elements that should exhibit nondissipative transport in one direction while being resistive in the opposite direction. Multiple examples of such devices have emerged in the past couple of years; ho ... Full text Cite

Anisotropic superconductivity at KTaO3(111) interfaces.

Journal Article Science advances · February 2023 A two-dimensional, anisotropic superconductivity was recently found at the KTaO3(111) interfaces. The nature of the anisotropic superconducting transition remains a subject of debate. To investigate the origins of the observed behavior, we grew ... Full text Cite

Graphene-Based Quantum Hall Interferometer with Self-Aligned Side Gates.

Journal Article Nano letters · December 2022 The vanishing band gap of graphene has long presented challenges for making high-quality quantum point contacts (QPCs)─the partially transparent p-n interfaces introduced by conventional split gates tend to short circuit the QPCs. This complication has hin ... Full text Cite

Dynamical Stabilization of Multiplet Supercurrents in Multiterminal Josephson Junctions.

Journal Article Nano letters · September 2022 The dynamical properties of multiterminal Josephson junctions (MT-JJs) have attracted interest, driven by the promise of new insights into synthetic topological phases of matter and Floquet states. This effort has culminated in the discovery of Cooper mult ... Full text Cite

Multiterminal Inverse AC Josephson Effect.

Journal Article Nano letters · November 2021 When a Josephson junction is exposed to microwave radiation, it undergoes the inverse AC Josephson effect─the phase of the junction locks to the drive frequency. As a result, the I-V curves of the junction acquire "Shapiro steps" of quantized ... Full text Open Access Cite

One-dimensional edge contact to encapsulated MoS2 with a superconductor

Journal Article AIP Advances · April 1, 2021 Establishing ohmic contact to van der Waals semiconductors such as MoS2 is crucial to unlocking their full potential in next-generation electronic devices. Encapsulation of few layer MoS2 with hBN preserves the material’s electronic properties but makes el ... Full text Open Access Cite

Zero Crossing Steps and Anomalous Shapiro Maps in Graphene Josephson Junctions.

Journal Article Nano letters · October 2020 The AC Josephson effect manifests itself in the form of "Shapiro steps" of quantized voltage in Josephson junctions subject to radiofrequency (RF) radiation. This effect presents an early example of a driven-dissipative quantum phenomenon and is presently ... Full text Open Access Cite

Interference of Chiral Andreev Edge States

Journal Article Nature Physics · May 18, 2020 The search for topological excitations such as Majorana fermions has spurred interest in the boundaries between distinct quan- tum states. Here, we explore an interface between two prototypical phases of electrons with conceptually different ground states: ... Full text Open Access Link to item Cite

Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions

Journal Article Physical Review Research · November 7, 2019 We investigate supercurrent interference patterns measured as a function of magnetic field in ballistic graphene Josephson junctions. At high doping, the expected φ0-periodic "Fraunhofer"pattern is observed, indicating a uniform current distribution. Close ... Full text Open Access Cite

Loss and Decoherence at the Quantum Hall-Superconductor Interface.

Journal Article Physical review letters · October 2023 We perform a systematic study of Andreev conversion at the interface between a superconductor and graphene in the quantum Hall (QH) regime. We find that the probability of Andreev conversion from electrons to holes follows an unexpected but clear trend: th ... Full text Open Access Cite

Nonreciprocal Supercurrents in a Field-Free Graphene Josephson Triode.

Journal Article Nano letters · June 2023 Superconducting diodes are proposed nonreciprocal circuit elements that should exhibit nondissipative transport in one direction while being resistive in the opposite direction. Multiple examples of such devices have emerged in the past couple of years; ho ... Full text Cite

Anisotropic superconductivity at KTaO3(111) interfaces.

Journal Article Science advances · February 2023 A two-dimensional, anisotropic superconductivity was recently found at the KTaO3(111) interfaces. The nature of the anisotropic superconducting transition remains a subject of debate. To investigate the origins of the observed behavior, we grew ... Full text Cite

Graphene-Based Quantum Hall Interferometer with Self-Aligned Side Gates.

Journal Article Nano letters · December 2022 The vanishing band gap of graphene has long presented challenges for making high-quality quantum point contacts (QPCs)─the partially transparent p-n interfaces introduced by conventional split gates tend to short circuit the QPCs. This complication has hin ... Full text Cite

Dynamical Stabilization of Multiplet Supercurrents in Multiterminal Josephson Junctions.

Journal Article Nano letters · September 2022 The dynamical properties of multiterminal Josephson junctions (MT-JJs) have attracted interest, driven by the promise of new insights into synthetic topological phases of matter and Floquet states. This effort has culminated in the discovery of Cooper mult ... Full text Cite

Multiterminal Inverse AC Josephson Effect.

Journal Article Nano letters · November 2021 When a Josephson junction is exposed to microwave radiation, it undergoes the inverse AC Josephson effect─the phase of the junction locks to the drive frequency. As a result, the I-V curves of the junction acquire "Shapiro steps" of quantized ... Full text Open Access Cite

One-dimensional edge contact to encapsulated MoS2 with a superconductor

Journal Article AIP Advances · April 1, 2021 Establishing ohmic contact to van der Waals semiconductors such as MoS2 is crucial to unlocking their full potential in next-generation electronic devices. Encapsulation of few layer MoS2 with hBN preserves the material’s electronic properties but makes el ... Full text Open Access Cite

Zero Crossing Steps and Anomalous Shapiro Maps in Graphene Josephson Junctions.

Journal Article Nano letters · October 2020 The AC Josephson effect manifests itself in the form of "Shapiro steps" of quantized voltage in Josephson junctions subject to radiofrequency (RF) radiation. This effect presents an early example of a driven-dissipative quantum phenomenon and is presently ... Full text Open Access Cite

Interference of Chiral Andreev Edge States

Journal Article Nature Physics · May 18, 2020 The search for topological excitations such as Majorana fermions has spurred interest in the boundaries between distinct quan- tum states. Here, we explore an interface between two prototypical phases of electrons with conceptually different ground states: ... Full text Open Access Link to item Cite

Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions

Journal Article Physical Review Research · November 7, 2019 We investigate supercurrent interference patterns measured as a function of magnetic field in ballistic graphene Josephson junctions. At high doping, the expected φ0-periodic "Fraunhofer"pattern is observed, indicating a uniform current distribution. Close ... Full text Open Access Cite

Chiral quasiparticle tunneling between quantum Hall edges in proximity with a superconductor

Journal Article Physical Review B · September 10, 2019 We study a two-terminal graphene Josephson junction with contacts shaped to form a narrow constriction, less than 100nm in length. The contacts are made from type-II superconducting contacts and able to withstand magnetic fields high enough to reach the qu ... Full text Open Access Cite

Quantum Hall-based superconducting interference device.

Journal Article Science advances · September 2019 We present a study of a graphene-based Josephson junction with dedicated side gates carved from the same sheet of graphene as the junction itself. These side gates are highly efficient and allow us to modulate carrier density along either edge of the junct ... Full text Open Access Cite

Subkelvin lateral thermal transport in diffusive graphene

Journal Article Physical Review B · March 29, 2019 In this work, we report on hot carrier diffusion in graphene across large enough length scales that the carriers are not thermalized across the crystal. The carriers are injected into graphene at one site and their thermal transport is studied as a functio ... Full text Open Access Cite

Supercurrent Flow in Multiterminal Graphene Josephson Junctions.

Journal Article Nano letters · February 2019 We investigate the electronic properties of ballistic planar Josephson junctions with multiple superconducting terminals. Our devices consist of monolayer graphene encapsulated in boron nitride with molybdenum-rhenium contacts. Resistance measurements yiel ... Full text Open Access Cite

Supercurrent in Graphene Josephson Junctions with Narrow Trenches in the Quantum Hall Regime

Journal Article MRS Advances · January 1, 2018 Coupling superconductors to quantum Hall edge states is the subject of intense investigation as part of the ongoing search for non-abelian excitations. Our group has previously observed supercurrents of hundreds of picoamperes in graphene Josephson junctio ... Full text Open Access Cite

Superconductivity: When Andreev meets Hall

Journal Article Nature Physics · July 1, 2017 Full text Open Access Cite

Investigation of Supercurrent in the Quantum Hall Regime in Graphene Josephson Junctions

Journal Article Submitted to the Journal of Low Temperature Physics · 2017 Open Access Cite

Ballistic Graphene Josephson Junctions from the Short to the Long Junction Regimes.

Journal Article Physical review letters · December 2016 We investigate the critical current I_{C} of ballistic Josephson junctions made of encapsulated graphene-boron-nitride heterostructures. We observe a crossover from the short to the long junction regimes as the length of the device increases. In long balli ... Full text Open Access Cite

Critical Current Scaling in Long Diffusive Graphene-Based Josephson Junctions.

Journal Article Nano letters · August 2016 We present transport measurements on long, diffusive, graphene-based Josephson junctions. Several junctions are made on a single-domain crystal of CVD graphene and feature the same contact width of ∼9 μm but vary in length from 400 to 1000 nm. As the carri ... Full text Open Access Cite

Supercurrent in the quantum Hall regime.

Journal Article Science (New York, N.Y.) · May 2016 A promising route for creating topological states and excitations is to combine superconductivity and the quantum Hall (QH) effect. Despite this potential, signatures of superconductivity in the QH regime remain scarce, and a superconducting current throug ... Full text Open Access Cite

Plasmonics in the UV range with Rhodium nanocubes

Conference Proceedings of SPIE - The International Society for Optical Engineering · January 1, 2016 Plasmonics in the UV-range constitutes a new challenge due to the increasing demand to detect, identify and destroy biological toxins, enhance biological imaging, and characterize semiconductor devices at the nanometer scale. Silver and aluminum have an ef ... Full text Cite

Valleytronics: Could use a break

Journal Article Nature Physics · December 1, 2015 Full text Open Access Cite

Rhodium nanoparticles for ultraviolet plasmonics.

Journal Article Nano letters · February 2015 The nonoxidizing catalytic noble metal rhodium is introduced for ultraviolet plasmonics. Planar tripods of 8 nm Rh nanoparticles, synthesized by a modified polyol reduction method, have a calculated local surface plasmon resonance near 330 nm. By attaching ... Full text Open Access Cite

Importance of diameter control on selective synthesis of semiconducting single-walled carbon nanotubes.

Journal Article ACS nano · August 2014 The coexistence of semiconducting and metallic single-walled carbon nanotubes (SWNTs) during synthesis is one of the major bottlenecks that prevent their broad application for the next-generation nanoelectronics. Herein, we present more understanding and d ... Full text Open Access Cite

Tunable quantum phase transitions in a resonant level coupled to two dissipative baths

Journal Article Physical Review B - Condensed Matter and Materials Physics · February 18, 2014 We study tunneling through a resonant level connected to two dissipative bosonic baths: one is the resistive environment of the source and drain leads, while the second comes from coupling to potential fluctuations on a resistive gate. We show that several ... Full text Open Access Cite

Surface-enhanced Raman scattering plasmonic enhancement using DNA origami-based complex metallic nanostructures.

Journal Article Nano letters · January 2014 DNA origami is a novel self-assembly technique allowing one to form various two-dimensional shapes and position matter with nanometer accuracy. We use DNA origami templates to engineer surface-enhanced Raman scattering substrates. Specifically, gold nanopa ... Full text Open Access Cite

Phonon bottleneck in graphene-based Josephson junctions at millikelvin temperatures.

Journal Article Physical review letters · July 2013 We examine the nature of the transitions between the normal and superconducting branches in superconductor-graphene-superconductor Josephson junctions. We attribute the hysteresis between the switching (superconducting to normal) and retrapping (normal to ... Full text Open Access Cite

Nonequilibrium quantum transport through a dissipative resonant level

Journal Article Physical Review B - Condensed Matter and Materials Physics · June 21, 2013 The resonant-level model represents a paradigmatic quantum system which serves as a basis for many other quantum impurity models. We provide a comprehensive analysis of the nonequilibrium transport near a quantum phase transition in a spinless dissipative ... Full text Open Access Cite

Observation of majorana quantum critical behaviour in a resonant level coupled to a dissipative environment

Journal Article Nature Physics · January 1, 2013 A quantum phase transition is an abrupt change between two distinct ground states of a many-body system, driven by an external parameter. In the vicinity of the quantum critical point (QCP) where the transition occurs, a new phase may emerge that is determ ... Full text Open Access Cite

Intracellular Neural Recording with Pure Carbon Nanotube Probes.

Journal Article PLoS One · 2013 The computational complexity of the brain depends in part on a neuron's capacity to integrate electrochemical information from vast numbers of synaptic inputs. The measurements of synaptic activity that are crucial for mechanistic understanding of brain fu ... Full text Open Access Link to item Cite

Quantum phase transition in a resonant level coupled to interacting leads.

Journal Article Nature · August 2012 A Luttinger liquid is an interacting one-dimensional electronic system, quite distinct from the 'conventional' Fermi liquids formed by interacting electrons in two and three dimensions. Some of the most striking properties of Luttinger liquids are revealed ... Full text Open Access Cite

Pb-Graphene-Pb josephson junctions: Characterization in magnetic field

Journal Article IEEE Transactions on Applied Superconductivity · June 14, 2012 We fabricate superconductor-graphene-superconductor Josephson junctions with superconducting regions made of lead (Pb). The critical current through graphene may be modulated by the external magnetic field; the resulting Fraunhofer interference pattern sho ... Full text Open Access Cite

Ultra-sharp metal and nanotube-based probes for applications in scanning microscopy and neural recording.

Journal Article J Appl Phys · April 1, 2012 This paper discusses several methods for manufacturing ultra-sharp probes, with applications geared toward, but not limited to, scanning microscopy (STM, AFM) and intra-cellular recordings of neural signals. We present recipes for making tungsten, platinum ... Full text Open Access Link to item Cite

Observation of unitary conductance for resonant tunneling with dissipation

Conference Journal of Physics: Conference Series · January 1, 2012 We investigate tunneling through a resonant level formed in a carbon nanotube quantum dot contacted by resistive metal wires. These contacts create a dissipative environment for the electrons tunneling across the nanotube, thus suppressing the tunneling ra ... Full text Cite

Retrapping current, self-heating, and hysteretic current-voltage characteristics in ultranarrow superconducting aluminum nanowires

Journal Article Physical Review B - Condensed Matter and Materials Physics · November 8, 2011 Hysteretic I-V (current-voltage) curves are studied in narrow Al nanowires. The nanowires have a cross section as small as 50 nm2. We focus on the retrapping current in a down-sweep of the current, at which a nanowire re-enters the superconducting state fr ... Full text Open Access Cite

Switching currents limited by single phase slips in one-dimensional superconducting Al nanowires.

Journal Article Physical review letters · September 2011 An aluminum nanowire switches from superconducting to normal as the current is increased in an upsweep. The switching current (I(s)) averaged over upsweeps approximately follows the depairing critical current (I(c)) but falls below it. Fluctuations in I(s) ... Full text Open Access Cite

Phase diffusion in graphene-based Josephson junctions.

Journal Article Physical review letters · September 2011 We report on graphene-based Josephson junctions with contacts made from lead. The high transition temperature of this superconductor allows us to observe the supercurrent branch at temperatures up to ∼2 K, at which point we can detect a small, but nonzero, ... Full text Open Access Cite

Connecting the nanodots: programmable nanofabrication of fused metal shapes on DNA templates.

Journal Article Nano letters · August 2011 We present a novel method for producing complex metallic nanostructures of programmable design. DNA origami templates, modified to have DNA binding sites with a uniquely coded sequence, were adsorbed onto silicon dioxide substrates. Gold nanoparticles func ... Full text Open Access Cite

Two-stage Kondo effect and Kondo-box level spectroscopy in a carbon nanotube

Journal Article Physical Review B - Condensed Matter and Materials Physics · October 18, 2010 The concept of the "Kondo box" describes a single spin, antiferromagnetically coupled to a quantum dot with a finite level spacing. Here, a Kondo box is formed in a carbon nanotube interacting with a localized electron. We investigate the spins of its firs ... Full text Open Access Cite

Resonant tunneling in a dissipative environment

Journal Article Physical Review B - Condensed Matter and Materials Physics · June 22, 2009 We measure tunneling through a single quantum level in a carbon nanotube quantum dot connected to resistive metal leads. For the electrons tunneling to/from the nanotube, the leads serve as a dissipative environment, which suppresses the tunneling rate. In ... Full text Cite

Dependence of transport through carbon nanotubes on local coulomb potential

Journal Article JETP Letters · April 1, 2009 In this paper, we present the results of helium temperature transport measurements through carbon nanotubes using an AFM conductive tip as a mobile gate for creation of a local distributive Coulomb potential. In semiconducting nanotubes we observe shifting ... Full text Cite

Single-electron transistors made by chemical patterning of silicon dioxide substrates and selective deposition of gold nanoparticles

Journal Article Applied Physics Letters · September 2008 We describe a method to pattern SiO2 surfaces with colloidal gold nanoparticles by e-beam lithography and selective nanoparticle deposition. The simple technique allows us to deposit nanoparticles in continuous straight lines, just one nanoparticle wide an ... Cite

Su(4) mixed valence regime in carbon nanotube quantum dots

Journal Article Physica B: Condensed Matter · April 1, 2008 We study the evolution of conductance regimes in carbon nanotubes with doubly degenerate orbitals ("shells") by controlling the contact transparency within the same sample. For sufficiently open contacts, Kondo behavior is observed for 1, 2, and 3 electron ... Full text Cite

Zero-bias conductance in carbon nanotube quantum dots.

Journal Article Physical review letters · February 2008 We present numerical renormalization group calculations for the zero-bias conductance of quantum dots made from semiconducting carbon nanotubes. These explain and reproduce the thermal evolution of the conductance for different groups of orbitals, as the d ... Full text Cite

Stepwise Self-Assembly of DNA Tile Lattices Using dsDNA Bridges

Journal Article Journal of the American Chemical Society · 2008 Cite

Stepwise self-assembly of DNA tile lattices using dsDNA bridges.

Journal Article Journal of the American Chemical Society · January 2008 The simple helical motif of double-strand DNA (dsDNA) has typically been judged to be uninteresting for assembly in DNA-based nanotechnology applications. In this letter, we demonstrate construction of superstructures consisting of heterogeneous DNA motifs ... Full text Cite

Four-probe measurements of carbon nanotubes with narrow metal contacts

Journal Article Physical Review B - Condensed Matter and Materials Physics · October 25, 2007 We find that electrons in single-wall carbon nanotubes may propagate substantial distances (tens of nanometers) under metal contacts. We perform four-probe transport measurements of the nanotube conductance and observe significant deviations from the stand ... Full text Cite

Low-temperature conductive tip atomic force microscope for carbon nanotube probing and manipulation

Journal Article Applied Physics Letters · August 10, 2007 The authors describe conductive tip atomic force microscope used for imaging carbon nanotubes at low temperatures. The instrument allows them to measure the tip-nanotube conductance while performing the topographic scan of the nanotubes on a nonconductive ... Full text Cite

Evolution of transport regimes in carbon nanotube quantum dots.

Journal Article Physical review letters · August 2007 We study the evolution of conductance regimes in carbon nanotubes with doubly degenerate orbitals (shells) by controlling the contact transparency within the same sample. For sufficiently open contacts, Kondo behavior is observed for 1, 2, and 3 electrons ... Full text Cite

SU(2) and SU(4) Kondo effects in carbon nanotube quantum dots

Journal Article Physical Review B - Condensed Matter and Materials Physics · June 25, 2007 We study the SU(4) Kondo effect in carbon nanotube quantum dots, where doubly degenerate orbitals form four-electron "shells." The SU(4) Kondo behavior is investigated for one, two, and three electrons in the topmost shell. While the Kondo state of two ele ... Full text Cite

SU(4) and SU(2) Kondo Effects in Carbon Nanotube Quantum Dots

Journal Article Physical Review B · 2007 Cite

Persistent orbital degeneracy in carbon nanotubes

Journal Article Physical Review B - Condensed Matter and Materials Physics · November 6, 2006 The quantum-mechanical orbitals in carbon nanotube quantum dots are doubly degenerate over a large number of states. We argue that this experimental observation indicates that electrons are reflected without mode mixing at the nanotube-metal contacts. Two ... Full text Cite

Optimized fabrication and electrical analysis of silver nanowires templated on DNA molecules

Journal Article Applied Physics Letters · July 28, 2006 We report on the electrical conductivity measurement of silver nanowires templated on native X-bacteriophage and synthetic double-stranded DNA molecules. After an electroless chemical deposition, the metallized DNA wires have a diameter down to 15 nm and a ... Full text Cite

Silver nanowires templated on DNA molecules

Journal Article Applied Physics Letters · 2006 We report on the electrical conductivity measurement of silver nanowires templated on native λ-bacteriophage and synthetic double- stranded DNA molecules. After an electroless chemical deposition, the metallized DNA wires have a diameter down to 1 ... Cite

Self-assembled 1D DNA nanostructures as templates for silver nanowires

Journal Article 2nd Conference on Foundations of Nanoscience: Self-Assembled Architectures and Devices, FNANO 2005 · December 1, 2005 Cite

Three-Helix Bundle DNA Tiles Self-Assemble into 2D Lattice or 1D Templates for Silver Nanowires.

Journal Article Nano Letters · March 2005 We present a DNA nanostructure, the three- helix bundle (3HB), which consists of three double helical DNA domains connected by six immobile crossover junctions such that the helix axes are not coplanar. The 3HB motif presents a triangular cross-section ... Cite

Electronic nanostructures templated on self-assembled DNA scaffolds

Journal Article Nanotechnology · July 2004 We report on the self-assembly of one- and two-dimensional DNA scaffolds, which serve as templates for the targeted deposition of ordered nanoparticles and molecular arrays. TheDNAnanostructures are easy to reprogram, and we demonstrate two distinct con ... Link to item Cite

Modeling subsurface charge accumulation images of a quantum hall liquid

Journal Article Physical Review B - Condensed Matter and Materials Physics · September 15, 2002 Subsurface charge accumulation imaging is a cryogenic scanning probe technique that has recently been used to spatially probe incompressible strips formed in a two-dimensional electron system (2DES) at high magnetic fields. In this paper, we present a deta ... Full text Cite

Efficient CVD Growth of Single-Walled Carbon Nanotubes on Surfaces Using Carbon Monoxide Precursor

Journal Article Nano Letters · August 1, 2002 Single Walled carbon nanotubes (SWNTs) were grown directly on flat substrates using chemical vapor deposition (CVD) method with carbon monoxide and hydrogen mixture as feeding gas. Comparing with other CVD methods, this new approach yields higher efficienc ... Full text Cite

Determination of the resistance across incompressible strips through imaging of charge motion

Journal Article Physical Review B - Condensed Matter and Materials Physics · March 15, 2002 Using charge-accumulation imaging, we measure the charge flow across an incompressible strip and follow its evolution with magnetic field. The strip runs parallel to the edge of a gate deposited on the sample and forms at positions where an exact number of ... Cite

Determination of the resistance across incompressible strips through imaging of charge motion

Journal Article Physical Review B - Condensed Matter and Materials Physics · January 1, 2002 Using charge-accumulation imaging, we measure the charge flow across an incompressible strip and follow its evolution with magnetic field. The strip runs parallel to the edge of a gate deposited on the sample and forms at positions where an exact number of ... Full text Cite

Imaging of Low Compressibility Strips in the Quantum Hall Liquid

Journal Article Phys. Rev. B · December 2000 Cite

Topographic mapping of the quantum hall liquid using a few-electron bubble

Journal Article Science · July 7, 2000 A scanning probe technique was used to obtain a high-resolution map of the random electrostatic potential inside the quantum Hall liquid. A sharp metal tip, scanned above a semiconductor surface, sensed charges in an embedded twodimensional (2D) electron g ... Full text Cite

Imaging the low compressibility strips formed by the Quantum Hall liquid in a smooth potential gradient

Journal Article Physica E: Low-Dimensional Systems and Nanostructures · January 1, 2000 The two-dimensional electron gas (2DEG) in the quantum Hall regime close to integer filling factors was studied. In a smooth potential gradient, low-compressibility strips corresponding to integer Landau level filling factors are observed. These strips tur ... Full text Cite

Imaging of low-compressibility strips in the quantum Hall liquid

Journal Article Physical Review B - Condensed Matter and Materials Physics · 2000 Using subsurface charge accumulation scanning microscopy, we image strips of low compressibility corresponding to several integer quantum Hall filling factors. We study in detail the strips at Landau level filling factors ν=2 and 4. The observed strips app ... Cite

Comparative study of the negatively and positively charged excitons in gaas quantum wells

Journal Article Physical Review B - Condensed Matter and Materials Physics · January 1, 1999 We compare the photoluminescence spectra of the negatively and positively charged excitons in GaAs quantum wells. We use a structure which enables us to observe both complexes within the same sample. We find that their binding energy and Zeeman splitting a ... Full text Cite

Dynamics of charged excitons in GaAs quantum wells under high magnetic field

Journal Article Physica B: Condensed Matter · December 2, 1998 We report on time-resolved photoluminescence studies of charged and neutral excitons in a modulation doped GaAs quantum well under resonant excitation and high magnetic field. The radiative lifetime of the charged exciton is rather short, 60 ps at zero fie ... Full text Cite

Shake-up processes of a two-dimensional electron gas in GaAs/AlGaAs quantum wells at high magnetic fields

Journal Article Physica B: Condensed Matter · June 17, 1998 Shake-up processes in the photoluminescence spectra of a two-dimensional electron gas in a GaAs/AlGaAs quantum well at high magnetic fields are studied at a range of filling factors. We find that when the electrons occupy only the lowest Landau level these ... Full text Cite

Charged exciton dynamics in GaAs quantum wells

Journal Article Physical Review B - Condensed Matter and Materials Physics · January 1, 1998 We study the dynamics of the charged and neutral excitons in a modulation-doped GaAs quantum well by time-resolved photoluminescence under a resonant excitation. The radiative lifetime of the charged exciton is found to be surprisingly short, 60 ps. This t ... Full text Cite

Mechanism of shakeup processes in the photoluminescence of a two-dimensional electron gas at high magnetic fields

Journal Article Physical Review B - Condensed Matter and Materials Physics · January 1, 1997 We observe shakeup processes in the photoluminescence spectra of a two-dimensional electron gas in a (Formula presented) quantum well at high magnetic fields. We find that when the electrons occupy only the lowest Landau level these processes are strongly ... Full text Cite

Optical spectroscopy of neutral and charged excitons in GaAs/AlGaAs quantum wells in high magnetic fields

Journal Article Surface Science · July 20, 1996 We implement optical spectroscopy to study charged excitons in modulation-doped GaAs/AlGaAs quantum wells. We report the first observation of the positively charged exciton and of the triplet state of the negatively charged exciton. Applying a gate voltage ... Full text Cite

Shakeup processes in the recombination spectra of negatively charged excitons

Journal Article Physical Review B - Condensed Matter and Materials Physics · January 1, 1996 We report on shakeup processes in the luminescence spectra of a negatively charged exciton ((Formula presented)) at moderate magnetic fields. These processes manifest themselves as a series of low-energy satellite peaks emerging from the negatively charged ... Full text Cite

Negatively and positively charged excitons in quantum wells

Journal Article Physical Review B - Condensed Matter and Materials Physics · January 1, 1996 We report the observation of the positively charged exciton and of the triplet state of the negatively charged exciton in modulation doped GaAs quantum wells. Applying a gate voltage at high magnetic fields we find that the photoluminescence line of the tw ... Full text Cite

Charged excitons in GaAs quantum wells

Journal Article Il Nuovo Cimento D · November 1, 1995 We implement optical spectroscopy to study charged excitons (trions) in modulation-doped GaAs/AlGaAs quantum wells. We observe for the first time several new trions: the positively charged exciton, the light-hole negatively charged exciton and the triplet ... Full text Cite

4-wave-mixing in modulation-doped gaas quantum-wells under strong magnetic-fields

Journal Article Physica Status Solidi B-basic Research · March 1995 Cite

Four‐wave mixing in modulation‐doped GaAs quantum wells under strong magnetic fields

Journal Article physica status solidi (b) · January 1, 1995 Time‐resolved four‐wave mixing is used to study electron scattering in modulation‐doped GaAs quantum wells in high magnetic fields up to 8T. A strong increase in dephasing times in strong magnetic fields is observed and attributed to a decrease in the scat ... Full text Cite

Optical spectroscopy of a two-dimensional electron gas near the metal-insulator transition

Journal Article Physical Review Letters · January 1, 1995 We report on optical measurements of a two-dimensional electron gas near the metal-insulator transition. We observe the appearance of excitons and negatively charged excitons, X-, at the onset of the transition. The fact that these excitons appear at a rel ... Full text Cite

Biexcitons in short-pulse optical experiments in strong magnetic fields in GaAs quantum wells

Journal Article Physical Review B · January 1, 1994 We present time-resolved differential-absorption data for GaAs quantum wells, in which temporal oscillations originating in a biexcitonic pairing appear. We interpret the oscillations within a four-level model of the exciton-biexciton system, and discuss t ... Full text Cite

Biexcitonic effects in transient nonlinear optical experiments in quantum wells

Journal Article Physical Review B · January 1, 1993 We present a model for the nonlinear optical response of quantum wells, which includes biexcitons. We show that within this model, the interaction of two laser pulses, mediated by the nonlinear susceptibility, results in oscillations and in coupling betwee ... Full text Cite

Inverse AC Josephson Effect in Ballistic Multiterminal Graphene Josephson Junctions

Conference In multi-terminal Josephson junctions, the superconducting coupling is established between each pair of contacts across a common normal channel. The state of such junction is described by N-1 independent phase differences between pairs of contacts, where N ... Open Access Cite

Graphene-based Josephson Triode

Conference There has been a growing interest to the materials with broken time-reversal and inversion symmetry, which can support non-reciprocal superconducting currents [1]. This search for an intrinsic superconducting diode has so far resulted in devices that typic ... Open Access Cite