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Myung-Joong Hwang

Assistant Professor of Physics at Duke Kunshan University
DKU Faculty

Selected Publications


Cavity magnonics with easy-axis ferromagnets: Critically enhanced magnon squeezing and light-matter interaction

Journal Article Physical Review B · December 15, 2023 Generating and probing the magnon squeezing is an important challenge in the field of quantum magnonics. In this work, we propose a cavity magnonics setup with an easy-axis ferromagnet to address this challenge. To this end, we first establish a mechanism ... Full text Cite

Topological magnon-photon interaction for cavity magnonics

Journal Article Communications Physics · December 1, 2023 The study of cavity magnonics and topological insulators has made significant advances over the past decade, however the possibility of combining the two fields is still unexplored. Here, we explore such connection by investigating hybrid cavity systems th ... Full text Cite

Anomalous criticality with bounded fluctuations and long-range frustration induced by broken time-reversal symmetry

Journal Article Physical Review Research · October 1, 2023 We consider a one-dimensional Dicke lattice with complex photon hopping amplitudes and investigate the influence of time-reversal symmetry breaking due to synthetic magnetic fields. We show that, by tuning the total flux threading the lattice with a period ... Full text Cite

Dynamical scaling laws in the quantum q -state clock chain

Journal Article Physical Review B · April 1, 2023 We show that phase transitions in the quantum q-state clock model for q≤4 can be characterized by an enhanced decay behavior of the Loschmidt echo via a small quench. The quantum criticality of the quantum q-state clock model is numerically investigated by ... Full text Cite

Frustrated Superradiant Phase Transition.

Journal Article Physical review letters · April 2022 Frustration occurs when a system cannot find a lowest-energy configuration due to conflicting constraints. We show that a frustrated superradiant phase transition occurs when the ground-state superradiance of cavity fields due to local light-matter interac ... Full text Cite

Quantum Statistical Enhancement of the Collective Performance of Multiple Bosonic Engines.

Journal Article Physical review letters · May 2020 We consider an ensemble of indistinguishable quantum machines and show that quantum statistical effects can give rise to a genuine quantum enhancement of the collective thermodynamic performance. When multiple indistinguishable bosonic work resources are c ... Full text Cite

Dynamical scaling laws of out-of-time-ordered correlators

Journal Article Physical Review B · November 6, 2019 The out-of-time-ordered correlator (OTOC) is central to the understanding of information scrambling in quantum many-body systems. In this work, we show that the OTOC in a quantum many-body system close to its critical point obeys dynamical scaling laws whi ... Full text Cite

Ultrastrong-coupling regime of nondipolar light-matter interactions

Journal Article Physical Review A · November 29, 2018 Full text Cite

Dissipative phase transition in the open quantum Rabi model

Journal Article Physical Review A · January 17, 2018 Full text Cite

Spin-Mechanical Scheme with Color Centers in Hexagonal Boron Nitride Membranes.

Journal Article Physical review letters · December 2017 Featured Publication Recently observed quantum emitters in hexagonal boron nitride (hBN) membranes have a potential for achieving high accessibility and controllability thanks to the lower spatial dimension. Moreover, these objects naturally have a high sensitivity to vibratio ... Full text Cite

Metastability in the driven-dissipative Rabi model

Journal Article Physical Review A · February 14, 2017 Full text Cite

Probing the Dynamics of a Superradiant Quantum Phase Transition with a Single Trapped Ion.

Journal Article Physical review letters · February 2017 Featured Publication We demonstrate that the quantum phase transition (QPT) of the Rabi model and critical dynamics near the QPT can be probed in the setup of a single trapped ion. We first demonstrate that there exists equilibrium and nonequilibrium scaling functions of the R ... Full text Cite

Fate of photon blockade in the deep strong-coupling regime

Journal Article Physical Review A · September 15, 2016 Full text Cite

Quantum Phase Transition in the Finite Jaynes-Cummings Lattice Systems.

Journal Article Physical review letters · September 2016 Featured Publication Phase transitions are commonly held to occur only in the thermodynamical limit of a large number of system components. Here, we exemplify at the hand of the exactly solvable Jaynes-Cummings (JC) model and its generalization to finite JC lattices that finit ... Full text Cite

Excited-state quantum phase transition in the Rabi model

Journal Article Physical Review A · August 18, 2016 Full text Cite

Recurrent Delocalization and Quasiequilibration of Photons in Coupled Systems in Circuit Quantum Electrodynamics.

Journal Article Physical review letters · April 2016 Featured Publication We explore the photon population dynamics in two coupled circuit QED systems. For a sufficiently weak intercavity photon hopping, as the photon-cavity coupling increases, the dynamics undergoes double transitions first from a delocalized to a localized pha ... Full text Cite

Quantum Phase Transition and Universal Dynamics in the Rabi Model.

Journal Article Physical review letters · October 2015 Featured Publication We consider the Rabi Hamiltonian, which exhibits a quantum phase transition (QPT) despite consisting only of a single-mode cavity field and a two-level atom. We prove QPT by deriving an exact solution in the limit where the atomic transition frequency in t ... Full text Open Access Cite

Superconducting qubits coupled to torsional resonators.

Journal Article Journal of physics. Condensed matter : an Institute of Physics journal · September 2010 We propose a scheme of strong and tunable coupling between a superconducting phase qubit and a nanomechanical torsional resonator. In our scheme the torsional resonator directly modulates the largest energy scale (the Josephson coupling energy) of the phas ... Full text Cite

Cavity magnonics with easy-axis ferromagnets: Critically enhanced magnon squeezing and light-matter interaction

Journal Article Physical Review B · December 15, 2023 Generating and probing the magnon squeezing is an important challenge in the field of quantum magnonics. In this work, we propose a cavity magnonics setup with an easy-axis ferromagnet to address this challenge. To this end, we first establish a mechanism ... Full text Cite

Topological magnon-photon interaction for cavity magnonics

Journal Article Communications Physics · December 1, 2023 The study of cavity magnonics and topological insulators has made significant advances over the past decade, however the possibility of combining the two fields is still unexplored. Here, we explore such connection by investigating hybrid cavity systems th ... Full text Cite

Anomalous criticality with bounded fluctuations and long-range frustration induced by broken time-reversal symmetry

Journal Article Physical Review Research · October 1, 2023 We consider a one-dimensional Dicke lattice with complex photon hopping amplitudes and investigate the influence of time-reversal symmetry breaking due to synthetic magnetic fields. We show that, by tuning the total flux threading the lattice with a period ... Full text Cite

Dynamical scaling laws in the quantum q -state clock chain

Journal Article Physical Review B · April 1, 2023 We show that phase transitions in the quantum q-state clock model for q≤4 can be characterized by an enhanced decay behavior of the Loschmidt echo via a small quench. The quantum criticality of the quantum q-state clock model is numerically investigated by ... Full text Cite

Frustrated Superradiant Phase Transition.

Journal Article Physical review letters · April 2022 Frustration occurs when a system cannot find a lowest-energy configuration due to conflicting constraints. We show that a frustrated superradiant phase transition occurs when the ground-state superradiance of cavity fields due to local light-matter interac ... Full text Cite

Quantum Statistical Enhancement of the Collective Performance of Multiple Bosonic Engines.

Journal Article Physical review letters · May 2020 We consider an ensemble of indistinguishable quantum machines and show that quantum statistical effects can give rise to a genuine quantum enhancement of the collective thermodynamic performance. When multiple indistinguishable bosonic work resources are c ... Full text Cite

Dynamical scaling laws of out-of-time-ordered correlators

Journal Article Physical Review B · November 6, 2019 The out-of-time-ordered correlator (OTOC) is central to the understanding of information scrambling in quantum many-body systems. In this work, we show that the OTOC in a quantum many-body system close to its critical point obeys dynamical scaling laws whi ... Full text Cite

Ultrastrong-coupling regime of nondipolar light-matter interactions

Journal Article Physical Review A · November 29, 2018 Full text Cite

Dissipative phase transition in the open quantum Rabi model

Journal Article Physical Review A · January 17, 2018 Full text Cite

Spin-Mechanical Scheme with Color Centers in Hexagonal Boron Nitride Membranes.

Journal Article Physical review letters · December 2017 Featured Publication Recently observed quantum emitters in hexagonal boron nitride (hBN) membranes have a potential for achieving high accessibility and controllability thanks to the lower spatial dimension. Moreover, these objects naturally have a high sensitivity to vibratio ... Full text Cite

Metastability in the driven-dissipative Rabi model

Journal Article Physical Review A · February 14, 2017 Full text Cite

Probing the Dynamics of a Superradiant Quantum Phase Transition with a Single Trapped Ion.

Journal Article Physical review letters · February 2017 Featured Publication We demonstrate that the quantum phase transition (QPT) of the Rabi model and critical dynamics near the QPT can be probed in the setup of a single trapped ion. We first demonstrate that there exists equilibrium and nonequilibrium scaling functions of the R ... Full text Cite

Fate of photon blockade in the deep strong-coupling regime

Journal Article Physical Review A · September 15, 2016 Full text Cite

Quantum Phase Transition in the Finite Jaynes-Cummings Lattice Systems.

Journal Article Physical review letters · September 2016 Featured Publication Phase transitions are commonly held to occur only in the thermodynamical limit of a large number of system components. Here, we exemplify at the hand of the exactly solvable Jaynes-Cummings (JC) model and its generalization to finite JC lattices that finit ... Full text Cite

Excited-state quantum phase transition in the Rabi model

Journal Article Physical Review A · August 18, 2016 Full text Cite

Recurrent Delocalization and Quasiequilibration of Photons in Coupled Systems in Circuit Quantum Electrodynamics.

Journal Article Physical review letters · April 2016 Featured Publication We explore the photon population dynamics in two coupled circuit QED systems. For a sufficiently weak intercavity photon hopping, as the photon-cavity coupling increases, the dynamics undergoes double transitions first from a delocalized to a localized pha ... Full text Cite

Quantum Phase Transition and Universal Dynamics in the Rabi Model.

Journal Article Physical review letters · October 2015 Featured Publication We consider the Rabi Hamiltonian, which exhibits a quantum phase transition (QPT) despite consisting only of a single-mode cavity field and a two-level atom. We prove QPT by deriving an exact solution in the limit where the atomic transition frequency in t ... Full text Open Access Cite

Superconducting qubits coupled to torsional resonators.

Journal Article Journal of physics. Condensed matter : an Institute of Physics journal · September 2010 We propose a scheme of strong and tunable coupling between a superconducting phase qubit and a nanomechanical torsional resonator. In our scheme the torsional resonator directly modulates the largest energy scale (the Josephson coupling energy) of the phas ... Full text Cite