Many-body physics in two-component Bose-Einstein condensates in a cavity: fragmented superradiance and polarization

We consider laser-pumped one-dimensional two-component bosons in a parabolic trap embedded in a high-finesse optical cavity. Above a threshold pump power, the photons that populate the cavity modify the effective atom trap and mediate a coupling between the two components of the Bose-Einstein conden...

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Bibliographic Details
Published in:New journal of physics 2018-05, Vol.20 (5), p.55006
Main Authors: Lode, Axel U J, Diorico, Fritz S, Wu, RuGway, Molignini, Paolo, Papariello, Luca, Lin, Rui, Lévêque, Camille, Exl, Lukas, Tsatsos, Marios C, Chitra, R, Mauser, Norbert J
Format: Article
Language:English
Subjects:
Atomic and Molecular Clusters
Bose-Einstein condensates
Bosons
Computational Physics
Condensed Matter
Coupling
Eigenvalues
Lasers
light-matter interaction
many-body systems
Mapping
MCTDHB
multi-component systems
Physics
Quantum Gases
Quantum Physics
time-dependent Schrödinger equation
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Summary:We consider laser-pumped one-dimensional two-component bosons in a parabolic trap embedded in a high-finesse optical cavity. Above a threshold pump power, the photons that populate the cavity modify the effective atom trap and mediate a coupling between the two components of the Bose-Einstein condensate. We calculate the ground state of the laser-pumped system and find different stages of self-organization depending on the power of the laser. The modified potential and the laser-mediated coupling between the atomic components give rise to rich many-body physics: an increase of the pump power triggers a self-organization of the atoms while an even larger pump power causes correlations between the self-organized atoms-the BEC becomes fragmented and the reduced density matrix acquires multiple macroscopic eigenvalues. In this fragmented superradiant state, the atoms can no longer be described as two-level systems and the mapping of the system to the Dicke model breaks down.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/aabc3a