73 citations · 607 across the 19 of their papers we have counts for
19 papers
Detecting axion dark matter with Rydberg atoms via induced electric dipole transitions
Georg Engelhardt, Amit Bhoonah, W. Vincent Liu
Long-standing efforts to detect axions are driven by two compelling prospects, naturally accounting for the absence of charge-conjugation and parity symmetry breaking in quantum ch…
Polariton Localization and Dispersion Properties of Disordered Quantum Emitters in Multimode Microcavities
Georg Engelhardt, Jianshu Cao
Experiments have demonstrated that the strong light-matter coupling in polaritonic microcavities significantly enhances transport. Motivated by these experiments, we have solved th…
Unified Light-Matter Floquet Theory and its Application to Quantum Communication
Georg Engelhardt, Sayan Choudhury, W. Vincent Liu
Periodically-driven quantum systems can exhibit a plethora of intriguing non-equilibrium phenomena that can be analyzed using Floquet theory. Naturally, Floquet theory is employed…
Unusual Dynamical Properties of Disordered Polaritons in Micocavities
Georg Engelhardt, Jianshu Cao
The strong light-matter interaction in microcavities gives rise to intriguing phenomena, such as cavity-mediated transport that can potentially overcome the Anderson localization.…
Dynamical symmetries of periodically-driven quantum systems and their spectroscopic signatures
Georg Engelhardt, Jianshu Cao
Spatial symmetries of quantum systems leads to important effects in spectroscopy, such as selection rules and dark states. Motivated by the increasing strength of light-matter inte…
Discontinuities in driven spin-boson systems due to coherent destruction of tunneling: breakdown of the Floquet-Gibbs distribution
Georg Engelhardt, Gloria Platero, Jianshu Cao
We show that the probability distribution of the stationary state of a dissipative ac-driven two-level system exhibits discontinuities, i.e. jumps, for parameters at which coherent…
Tuning the Aharonov-Bohm effect with dephasing in nonequilibrium transport
Georg Engelhardt, Jianshu Cao
The Aharanov-Bohm (AB) effect, which predicts that a magnetic field strongly influences the wave function of an electrically charged particle, is investigated in a three site syste…
Thermoelectric performance of topological boundary modes
Sina Böhling, Georg Engelhardt, Gloria Platero +1
We investigate quantum transport and thermoelectrical properties of a finite-size Su-Schrieffer-Heeger model, a paradigmatic model for a one-dimensional topological insulator, whic…
An electronic Maxwell demon in the coherent strong-coupling regime
Gernot Schaller, Javier Cerrillo, Georg Engelhardt +1
We consider a feedback control loop rectifying particle transport through a single quantum dot that is coupled to two electronic leads. While monitoring the occupation of the dot,…
Maxwell's demon in the quantum-Zeno regime and beyond
G. Engelhardt, G. Schaller
The long-standing paradigm of Maxwell's demon is till nowadays a frequently investigated issue, which still provides interesting insights into basic physical questions. Considering…
Random-walk topological transition revealed via electron counting
G. Engelhardt, M. Benito, G. Platero +2
The appearance of topological effects in systems exhibiting a non-trivial topological band structure strongly relies on the coherent wave nature of the equations of motion. Here, w…
Topologically-enforced bifurcations in superconducting circuits
G. Engelhardt, M. Benito, G. Platero +1
The relation of topological insulators and superconductors and the field of nonlinear dynamics is widely unexplored. To address this subject, we adopt the linear coupling geometry…
Semiclassical bifurcations and topological phase transitions in a one-dimensional lattice of coupled Lipkin-Meshkov-Glick models
A. V. Sorokin, M. Aparicio Alcalde, V. M. Bastidas +3
In this work we study a one-dimensional lattice of Lipkin-Meshkov-Glick models with alternating couplings between nearest-neighbors sites, which resembles the Su-Schrieffer-Heeger…
Bosonic Josephson effect in the Fano-Anderson model
G. Engelhardt, G. Schaller, T. Brandes
We investigate the coherent dynamics of a non-interacting Bose-Einstein condensate in a system consisting of two bosonic reservoirs coupled via a spatially localized mode. We descr…
Topological instabilities in ac-driven bosonic systems
G. Engelhardt, M. Benito, G. Platero +1
Under non-equilibrium conditions, bosonic modes can become dynamically unstable with an exponentially growing occupation. On the other hand, topological band structures give rise t…
Topological Bogoliubov excitations in inversion-symmetric systems of interacting bosons
G. Engelhardt, T. Brandes
On top of the mean-field analysis of a Bose-Einstein condensate, one typically applies the Bogoliubov theory to analyze quantum fluctuations of the excited modes. Therefore, one ha…
Critical quasienergy states in driven many-body systems
Victor Manuel Bastidas, Georg Engelhardt, Pedro Perez-Fernandez +2
We discuss singularities in the spectrum of driven many-body spin systems. In contrast to undriven models, the driving allows us to control the geometry of the quasienergy landscap…
Excited-state quantum phase transitions and periodic dynamics
G. Engelhardt, V. M. Bastidas, W. Kopylov +1
We investigate signatures of the excited-state quantum phase transition in the periodic dynamics of the Lipkin-Meshkov-Glick model and the Tavis-Cummings model. In the thermodynami…
AC-driven Quantum Phase Transition in the Lipkin-Meshkov-Glick Model
G. Engelhardt, V. M. Bastidas, C. Emary +1
We establish a set of nonequilibrium quantum phase transitions in the Lipkin-Meshkov-Glick model under monochromatic modulation of the inter-particle interaction. We show that the…