Dissipation-induced structural instability and chiral dynamics in a quantum gas.

Published on Dec 20, 2019in Science47.728
路 DOI :10.1126/SCIENCE.AAW4465
Nishant Dogra7
Estimated H-index: 7
(ETH Zurich),
Manuele Landini10
Estimated H-index: 10
(ETH Zurich)
+ 3 AuthorsTilman Esslinger69
Estimated H-index: 69
(ETH Zurich)
Sources
Abstract
Dissipative and unitary processes define the evolution of a many-body system. Their interplay gives rise to dynamical phase transitions and can lead to instabilities. In this study, we observe a nonstationary state of chiral nature in a synthetic many-body system with independently controllable unitary and dissipative couplings. Our experiment is based on a spinor Bose gas interacting with an optical resonator. Orthogonal quadratures of the resonator field coherently couple the Bose-Einstein condensate to two different atomic spatial modes, whereas the dispersive effect of the resonator losses mediates a dissipative coupling between these modes. In a regime of dominant dissipative coupling, we observe the chiral evolution and relate it to a positional instability.
馃摉 Papers frequently viewed together
References36
Newest
#1E. I. Rodr铆guez Chiacchio (University of Cambridge)H-Index: 3
#2Andreas Nunnenkamp (University of Cambridge)H-Index: 30
We investigate the dynamics of a spinor Bose-Einstein condensate inside an optical cavity, driven transversely by a laser with a controllable polarization angle. We focus on a two-component Dicke model with complex light-matter couplings, in the presence of photon losses. We calculate the steady-state phase diagram and find dynamical instabilities in the form of limit cycles, heralded by the presence of exceptional points and level attraction. We show that the instabilities are induced by dissip...
Source
#1Berislav Bu膷a (University of Oxford)H-Index: 13
#2Joseph Tindall (University of Oxford)H-Index: 10
Last. Dieter Jaksch (University of Oxford)H-Index: 60
view all 3 authors...
The assumption that quantum systems relax to a stationary state in the long-time limit underpins statistical physics and much of our intuitive understanding of scientific phenomena. For isolated systems this follows from the eigenstate thermalization hypothesis. When an environment is present the expectation is that all of phase space is explored, eventually leading to stationarity. Notable exceptions are decoherence-free subspaces that have important implications for quantum technologies and ha...
Source
#1Jeremy T. Young (UMD: University of Maryland, College Park)H-Index: 10
#2Alexey V. Gorshkov (UMD: University of Maryland, College Park)H-Index: 55
Last. Mohammad F. MaghrebiH-Index: 18
view all 4 authors...
Driven-dissipative systems can exhibit non-equilibrium phenomena that are absent in their equilibrium counterparts. However, phase transitions present in these systems generically exhibit an effectively classical equilibrium behavior in spite of their quantum non-equilibrium origin. In this paper, we show that multicritical points in driven-dissipative systems can give rise to genuinely non-equilibrium behavior. We investigate a non-equilibrium driven-dissipative model of interacting bosons that...
Source
#1Mohammad-Ali Miri (University of Texas at Austin)H-Index: 31
#2Andrea Al霉H-Index: 118
BACKGROUND Singularities are critical points for which the behavior of a mathematical model governing a physical system is of a fundamentally different nature compared to the neighboring points. Exceptional points are spectral singularities in the parameter space of a system in which two or more eigenvalues, and their corresponding eigenvectors, simultaneously coalesce. Such degeneracies are peculiar features of nonconservative systems that exchange energy with their surrounding environment. In ...
Source
#1N. R. BernierH-Index: 7
#2L. D. T贸thH-Index: 7
Last. Tobias J. KippenbergH-Index: 99
view all 4 authors...
Level repulsion - the opening of a gap between two degenerate modes due to coupling - is ubiquitous anywhere from solid state theory to quantum chemistry. In contrast, if one mode has negative energy, the mode frequencies attract instead. They converge and develop imaginary components, leading to an instability; an exceptional point marks the transition. This, however, only occurs if the dissipation rates of the two modes are comparable. Here we expose a theoretical framework for the general phe...
Source
#1Manuele Landini (ETH Zurich)H-Index: 10
#2Nishant Dogra (ETH Zurich)H-Index: 7
Last. Tilman Esslinger (ETH Zurich)H-Index: 69
view all 6 authors...
We observe cavity mediated spin-dependent interactions in an off-resonantly driven multi-level atomic Bose-Einstein condensate that is strongly coupled to an optical cavity. Applying a driving field with adjustable polarization, we identify the roles of the scalar and the vectorial components of the atomic polarizability tensor for single and multi-component condensates. Beyond a critical strength of the vectorial coupling, we observe a spin texture in a condensate of two internal states, provid...
Source
#1Matteo Soriente (ETH Zurich)H-Index: 3
#2Tobias Donner (ETH Zurich)H-Index: 23
Last. Oded Zilberberg (ETH Zurich)H-Index: 26
view all 4 authors...
Dissipation can fundamentally influence quantum many-body systems and their phase transitions in often counter-intuitive ways. For example, new universality classes emerge in driven-dissipative systems, and dissipation can generate topological effects. Open system dynamics is particularly relevant as state of the art experiments are able to engineer and control dissipation channels. Concurrently, due to the inapplicability of the framework of equilibrium statistical physics, our understanding of...
Source
#1Dominik MaileH-Index: 2
#2Sabine AndergassenH-Index: 24
Last. Gianluca RastelliH-Index: 15
view all 4 authors...
We study the quantum phase transition of the one-dimensional phase model in the presence of dissipative frustration, provided by an interaction of the system with the environment through two non-commuting operators. Such a model can be realized in Josephson junction chains with shunt resistances and resistances between the chain and the ground. Using a self-consistent harmonic approximation, we determine the phase diagram at zero temperature which exhibits a quantum phase transition between an o...
Source
#1Ramy El-Ganainy (MTU: Michigan Technological University)H-Index: 37
#2Konstantinos G. Makris (UoC: University of Crete)H-Index: 31
Last. Demetrios N. Christodoulides (UCF: University of Central Florida)H-Index: 111
view all 6 authors...
This Review Article outlines the exploration of the interplay between parity鈥搕ime symmetry and non-Hermitian physics in optics, plasmonics and optomechanics.
Source
#1Thomas Fink (ETH Zurich)H-Index: 8
#2Anne SchadeH-Index: 8
Last. Atac Imamoglu (ETH Zurich)H-Index: 89
view all 5 authors...
Understanding and characterizing phase transitions in driven-dissipative systems constitutes a new frontier for many-body physics 1鈥8 . A generic feature of dissipative phase transitions is a vanishing gap in the Liouvillian spectrum 9 , which leads to long-lived deviations from the steady state as the system is driven towards the transition. Here, we show that photon correlation measurements can be used to characterize the corresponding critical slowing down of non-equilibrium dynamics. We focu...
Source
Cited By43
Newest
#1Jeremy T. YoungH-Index: 10
#2Alexey V. GorshkovH-Index: 55
Last. Ian B. SpielmanH-Index: 50
view all 3 authors...
The implementation of a combination of continuous weak measurement and classical feedback provides a powerful tool for controlling the evolution of quantum systems. In this work, we investigate the potential of this approach from three perspectives. First, we consider a double-well system in the classical large-atom-number limit, deriving the exact equations of motion in the presence of feedback. Second, we consider the same system in the limit of small atom number, revealing the effect that qua...
Source
The Landauer formula provides a general scattering formulation of electrical conduction. Despite its utility, it has been mainly applied to the linear-response regime, and a scattering theory of nonlinear response has yet to be fully developed. Here, we extend the Landauer formula to the nonlinear-response regime. We show that while the linear conductance is directly related to the transmission probability, the nonlinear conductance is given by its derivatives with respect to energy. This sensit...
The breaking of the continuous time-translation symmetry manifests, in Markovian open quantum systems, through the emergence of non-stationary dynamical phases. Systems that display nonequilibrium transitions into these phases are referred to as time-crystals, and they can be realized, for example, in many-body systems governed by collective dissipation and long-ranged interactions. Here, we provide a complete analytical characterization of a boundary time-crystal phase transition. This involves...
#1Giuseppe BuonaiutoH-Index: 5
#2Federico CarolloH-Index: 12
Last. Igor LesanovskyH-Index: 52
view all 4 authors...
We investigate the creation and control of emergent collective behavior and quantum correlations using feedback in an emitter-waveguide system using a minimal model. Employing homodyne detection of photons emitted from a laser-driven emitter ensemble into the modes of a waveguide allows to generate intricate dynamical phases. In particular, we show the emergence of a time-crystal phase, the transition to which is controlled by the feedback strength. Feedback enables furthermore the control of ma...
#1Shane P. Kelly (UCR: University of California, Riverside)H-Index: 6
#2Eddy Timmermans (LANL: Los Alamos National Laboratory)H-Index: 7
Last. Shan-Wen Tsai (UCR: University of California, Riverside)H-Index: 18
view all 4 authors...
We unveil a mechanism for generating oscillations with arbitrary multiplets of the period of a given external drive, in long-range interacting quantum many-particle spin systems. These oscillations break discrete time translation symmetry as in time crystals, but they are understood via two intertwined stroboscopic effects similar to the aliasing resulting from video taping a single fast rotating helicopter blade. The first effect is similar to a single blade appearing as multiple blades due to ...
Source
#2Francesco FerriH-Index: 1
Last. Tilman EsslingerH-Index: 69
view all 9 authors...
We report on the experimental realization and detection of dynamical currents in a spin-textured lattice in momentum space. Collective tunneling is implemented via cavity-assisted Raman scattering of photons by a spinor Bose-Einstein condensate into an optical cavity. The photon field inducing the tunneling processes is subject to cavity dissipation, resulting in effective directional dynamics in a non-Hermitian setting. We observe that the individual tunneling events are superradiant in nature ...
#2Hans Ke脽lerH-Index: 11
Last. Andreas HemmerichH-Index: 36
view all 6 authors...
A periodically driven open three-level Dicke model is realized by resonantly shaking the pump field in an atom-cavity system. As an unambiguous signature, we demonstrate the emergence of a dynamical phase, in which the atoms periodically localize between the antinodes of the pump lattice, associated with an oscillating net momentum along the pump axis. We observe this dynamical phase through the periodic switching of the relative phase between the pump and cavity fields at a small fraction of th...
#1Jim SkulteH-Index: 2
Last. Jayson G. CosmeH-Index: 9
view all 6 authors...
We investigate the three-level Dicke model, which describes a fundamental class of light-matter systems. We determine the phase diagram in the presence of dissipation, which we assume to derive from photon loss. Utilizing both analytical and numerical methods we characterize incommensurate time crystalline states in this phase diagram, as well as light-induced and light-enhanced superradiant states. As a primary application, we demonstrate that a shaken atom-cavity system is naturally approximat...
#1Andisheh Khedri (ETH Zurich)H-Index: 2
#2Antonio 艩trkalj (ETH Zurich)H-Index: 3
Last. Oded Zilberberg (ETH Zurich)H-Index: 26
view all 4 authors...
Source
#1Matteo Soriente (ETH Zurich)H-Index: 3
#2Toni L. Heugel (ETH Zurich)H-Index: 4
Last. Oded Zilberberg (ETH Zurich)H-Index: 26
view all 5 authors...
This work introduces method to analyze dissipation-induced phase transitions that take the system out of its ground state and stabilize a higher-energy stationary state.
Source
This website uses cookies.
We use cookies to improve your online experience. By continuing to use our website we assume you agree to the placement of these cookies.
To learn more, you can find in our Privacy Policy.