Many-body physics in two-component Bose-Einstein condensates in a cavity: fragmented superradiance and polarization
Lode, Axel U.J.
Diorico, Fritz S.
Tsatsos, Marios C.
Mauser, Norbert J.
- Journal Article
Rights / licenseCreative Commons Attribution 3.0 Unported
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. Show more
Journal / seriesNew Journal of Physics
Pages / Article No.
PublisherInstitute of Physics Publishing
Subjectmany body systems; time dependent Schrodinger equation; Bose-Einstein condensates; light-matter interaction; multi-component systems; MCTDHB
Organisational unit03571 - Sigrist, Manfred / Sigrist, Manfred
03571 - Sigrist, Manfred / Sigrist, Manfred
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