Dissipative Bose–Einstein condensation in contact with a thermal reservoir

Caspar, Stephan; Hebenstreit, Florian; Mesterhazy, David; Wiese, Uwe-Jens (2016). Dissipative Bose–Einstein condensation in contact with a thermal reservoir. New journal of physics, 18(7), 073015. Institute of Physics Publishing IOP 10.1088/1367-2630/18/7/073015

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We investigate the real-time dynamics of open quantum spin-1/2 or hardcore boson systems on a spatial lattice, which are governed by a Markovian quantum master equation.Wederive general conditions under which the hierarchy of correlation functions closes such that their time evolution can be computed semi-analytically. Expanding our previous work (2016 Phys. Rev. A 93 021602) we demonstrate the universality of a purely dissipative quantum Markov process that drives the system of spin-1/2 particles into a totally symmetric superposition state, corresponding to a Bose–Einstein condensate of hardcore bosons. In particular, we show that the finite-size scaling behavior of the dissipative gap is independent of the chosen boundary conditions and the underlying lattice structure. In addition, we consider the effect of a uniform magnetic field as well as a coupling to a thermal bath to investigate the susceptibility of the engineered dissipative process to unitary and nonunitary perturbations.Weestablish the nonequilibrium steady-state phase diagram as a function of temperature and dissipative coupling strength. For a small number of particles N,we identify a parameter region in which the engineered symmetrizing dissipative process performs robustly, while in the thermodynamic limit N→∞, the coupling to the thermal bath destroys any long-range order.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Caspar, Stephan; Hebenstreit, Florian; Mesterhazy, David and Wiese, Uwe-Jens

Subjects:

500 Science > 530 Physics

ISSN:

1367-2630

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

08 Aug 2016 13:28

Last Modified:

14 Aug 2016 02:09

Publisher DOI:

10.1088/1367-2630/18/7/073015

ArXiv ID:

1604.03725

BORIS DOI:

10.7892/boris.85283

URI:

https://boris.unibe.ch/id/eprint/85283

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