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pro vyhledávání: '"Engelhardt, G."'
Photon-resolved Floquet theory keeps track of the photon exchange of a quantum system with a coherent driving field. It thus complements the standard full-counting statistics that counts the number of photons exchanged with incoherent photon modes gi
Externí odkaz:
http://arxiv.org/abs/2311.01509
Autor:
Engelhardt, G., Schaller, G.
Publikováno v:
New Journal of Physics 20, 023011 (2018)
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 a single-electron transistor, where we implement a Maxwell demon by a
Externí odkaz:
http://arxiv.org/abs/1710.06306
Publikováno v:
Phys. Rev. B 96, 241404 (2017)
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, we reveal topological dynamics in a classical stochastic random walk ve
Externí odkaz:
http://arxiv.org/abs/1707.06096
Publikováno v:
Phys. Rev. Lett. 118, 197702 (2017)
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 of the Su-Schrieffer-Heeger model, a paradigmatic example for a topolo
Externí odkaz:
http://arxiv.org/abs/1611.01467
Autor:
Sorokin, A. V., Alcalde, M. Aparicio, Bastidas, V. M., Engelhardt, G., Angelakis, D. G., Brandes, T.
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 model. Typical properties of the underlying models are present in our
Externí odkaz:
http://arxiv.org/abs/1604.08023
Publikováno v:
Phys. Rev. A 94, 013608 (2016)
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 describe this system by a two-terminal Fano-Anderson model and investigate
Externí odkaz:
http://arxiv.org/abs/1604.03777
Publikováno v:
Phys. Rev. Lett. 117, 045302 (2016)
Under non-equilibrium conditions, bosonic modes can become dynamically unstable with an exponentially growing occupation. On the other hand, topological band structures give rise to symmetry protected midgap states. In this letter, we investigate the
Externí odkaz:
http://arxiv.org/abs/1512.07653
Autor:
Engelhardt, G., Brandes, T.
Publikováno v:
Phys. Rev. A 91, 053621 (2015)
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 has to diagonalize the Bogoliubov Hamiltonian in a symplectic manner. In
Externí odkaz:
http://arxiv.org/abs/1503.02503
Publikováno v:
Phys. Rev. A 91, 013631 (2015)
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 thermodynamic limit, expectation values of observables in eigenstates of the syste
Externí odkaz:
http://arxiv.org/abs/1405.3514
Publikováno v:
Phys. Rev. E 87, 052110 (2013)
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 external driving induces a rich phase diagram that characterizes the m
Externí odkaz:
http://arxiv.org/abs/1211.2683