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Universal Nonequilibrium I-V Curve at an Interacting Impurity Quantum Critical Point

Publication ,  Journal Article
Zhang, G; Chung, C-H; Ke, CT; Lin, C-Y; Mebrahtu, H; Smirnov, AI; Finkelstein, G; Baranger, HU
Published in: Physical Review Research
February 11, 2021

Nonequilibrium properties of correlated quantum matter are being intensively investigated because of the rich interplay between external driving and the many-body correlations. Of particular interest is the nonequilibrium behavior near a quantum critical point (QCP), where the system is delicately balanced between different ground states. We present both an analytical calculation of the nonequilibrium steady-state current in a critical system and experimental results to which the theory is compared. The system is a quantum dot coupled to resistive leads: a spinless resonant level interacting with an ohmic dissipative environment. A two-channel Kondo-like QCP occurs when the level is on resonance and symmetrically coupled to the leads, conditions achieved by fine tuning using electrostatic gates. We calculate and measure the nonlinear current as a function of bias (I−V curve) at the critical values of the gate voltages corresponding to the QCP. The quantitative agreement between the experimental data and the theory, with no fitting parameter, is excellent. As our system is fully accessible to both theory and experiment, it provides an ideal setting for addressing nonequilibrium phenomena in correlated quantum matter.

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Published In

Physical Review Research

DOI

ISSN

2643-1564

Publication Date

February 11, 2021

Volume

3

Start / End Page

013136 / 013136

Publisher

American Physical Society
 

Citation

APA
Chicago
ICMJE
MLA
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Zhang, G., Chung, C.-H., Ke, C. T., Lin, C.-Y., Mebrahtu, H., Smirnov, A. I., … Baranger, H. U. (2021). Universal Nonequilibrium I-V Curve at an Interacting Impurity Quantum Critical Point. Physical Review Research, 3, 013136–013136. https://doi.org/10.1103/PhysRevResearch.3.013136
Zhang, G., C. -. H. Chung, C. T. Ke, C. -. Y. Lin, H. Mebrahtu, A. I. Smirnov, G. Finkelstein, and H. U. Baranger. “Universal Nonequilibrium I-V Curve at an Interacting Impurity Quantum Critical Point.” Physical Review Research 3 (February 11, 2021): 013136–013136. https://doi.org/10.1103/PhysRevResearch.3.013136.
Zhang G, Chung C-H, Ke CT, Lin C-Y, Mebrahtu H, Smirnov AI, et al. Universal Nonequilibrium I-V Curve at an Interacting Impurity Quantum Critical Point. Physical Review Research. 2021 Feb 11;3:013136–013136.
Zhang, G., et al. “Universal Nonequilibrium I-V Curve at an Interacting Impurity Quantum Critical Point.” Physical Review Research, vol. 3, American Physical Society, Feb. 2021, pp. 013136–013136. Manual, doi:10.1103/PhysRevResearch.3.013136.
Zhang G, Chung C-H, Ke CT, Lin C-Y, Mebrahtu H, Smirnov AI, Finkelstein G, Baranger HU. Universal Nonequilibrium I-V Curve at an Interacting Impurity Quantum Critical Point. Physical Review Research. American Physical Society; 2021 Feb 11;3:013136–013136.

Published In

Physical Review Research

DOI

ISSN

2643-1564

Publication Date

February 11, 2021

Volume

3

Start / End Page

013136 / 013136

Publisher

American Physical Society