Vortex formation and dynamics in two-dimensional driven-dissipative condensates

Hebenstreit, Florian (2016). Vortex formation and dynamics in two-dimensional driven-dissipative condensates. Physical review. A - atomic, molecular, and optical physics, 94(6), 063617. American Physical Society 10.1103/PhysRevA.94.063617

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We investigate the real-time evolution of lattice bosons in two spatial dimensions whose dynamics is governed by a Markovian quantum master equation. We employ the Wigner-Weyl phase space quantization and derive the functional integral for open quantum many-body systems that determines the time evolution of the Wigner function. Using the truncated Wigner approximation, in which quantum fluctuations are only taken into account in the initial state whereas the dynamics is governed by classical evolution equations, we study the buildup of long-range correlations due to the action of non-Hermitean quantum jump operators that constitute a mechanism for dissipative cooling. Starting from an initially disordered state corresponding to a vortex condensate, the dissipative process results in the annihilation of vortex-antivortex pairs and the establishment of quasi-long-range order at late times. We observe that a finite vortex density survives the cooling process, which disagrees with the analytically constructed vortex-free Bose-Einstein condensate at asymptotic times. This indicates that quantum fluctuations beyond the truncated Wigner approximation need to be included to fully capture the physics of dissipative Bose-Einstein condensation.

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:

Hebenstreit, Florian

Subjects:

500 Science > 530 Physics

ISSN:

1050-2947

Publisher:

American Physical Society

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

13 Feb 2017 14:32

Last Modified:

13 Feb 2017 14:32

Publisher DOI:

10.1103/PhysRevA.94.063617

BORIS DOI:

10.7892/boris.95491

URI:

https://boris.unibe.ch/id/eprint/95491

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