Collective and Non-Equilibrium Phenomena in Quantum Gases and Superconductors

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Quantum Science and Technology".

Deadline for manuscript submissions: closed (10 July 2022) | Viewed by 2527

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TQC, Universiteit Antwerpen, Universiteitsplein 1, B-2610 Antwerp, Belgium
Interests: condensed matter physics; quantum gases; polaron theory
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Special Issue Information

Dear Colleagues,

Recent experimental and theoretical studies in condensed matter and quantum gases show an increasing intersection of these two areas, because underlying physical mechanisms are remarkably similar. In superconductors and superfluid Fermi and Bose gases, the same phenomena (such as Higgs collective modes, Josephson junctions, multigap condensation) are currently being studied in the two communities.

In the same way, recent experimental breakthroughs on exciton–polaritons condensates have opened a new window on the physics of strongly interacting and out-of-equilibrium bosonic fluids, at a time when experiments on quenched atomic Bose–Einstein condensates are challenging state-of-the-art theories of interacting bosons by accessing new interaction regimes.

In this Special Issue, we focus on topical subjects of pair-condensed fermionic systems and out-of-equilibrium bosonic systems. We would like to confront recent experimental results on collective oscillation modes, polaritons, vortices, Josephson junctions, and other collective phenomena. We are also interested in highlighting to this audience topics of broader relevance such as bosonic mixtures, quenched dynamics, and non-equilibrium features in both ultracold and driven-dissipative condensates, to bring out other features of mutual interests across different condensed matter systems.

The main goal of this Special Issue is to bring together experts of condensed matter and ultracold quantum gases who are facing the same issues, and thus to contribute to the flow of innovative ideas between the two fields. The scope of the Issue includes new original experimental and theoretical results and review papers.

Dr. Serghei Klimin
Guest Editor

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Keywords

  • quantum gases
  • superconductors
  • collective excitations
  • non-equilibrium phenomena

Published Papers (1 paper)

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Research

9 pages, 1983 KiB  
Article
Self-Organized PT-Symmetry of Exciton-Polariton Condensate in a Double-Well Potential
by Panayotis A. Kalozoumis and David Petrosyan
Appl. Sci. 2021, 11(16), 7372; https://doi.org/10.3390/app11167372 - 11 Aug 2021
Cited by 3 | Viewed by 1894
Abstract
We investigate the dynamics and stationary states of a semiconductor exciton–polariton condensate in a double-well potential. We find that upon the population build-up of the polaritons by above-threshold laser pumping, coherence relaxation due to the phase fluctuations in the polaritons drives the system [...] Read more.
We investigate the dynamics and stationary states of a semiconductor exciton–polariton condensate in a double-well potential. We find that upon the population build-up of the polaritons by above-threshold laser pumping, coherence relaxation due to the phase fluctuations in the polaritons drives the system into a stable fixed point corresponding to a self-organized PT-symmetric phase. Full article
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