Two-mode Dicke model from nondegenerate polarization modes

Abstract

We realize a non-degenerate two-mode Dicke model with competing interactions in a Bose-Einstein condensate (BEC) coupled to two orthogonal polarization modes of a single optical cavity. The BEC is coupled to the cavity modes via the scalar and vectorial part of the atomic polarizability. We can independently change these couplings and determine their effect on a self-organization phase transition. Measuring the phases of the system, we characterize a crossover from a single-mode to a two-mode Dicke model. This work provides perspectives for the realization of coupled phases of spin and density. arXiv:1902.09831v1 [cond-mat.quant-gas]

Nonequilibrium magnetic phases in spin lattices with gain and loss

“…The described setting can be implemented, for example, using cold atoms in multimode optical cavities, similar to the experimental setups in Refs. [62][63][64]. To realize the full lattice model, one can extend the same techniques to arrays of photonic crystal cavities, as suggested for example in Refs.…”

Many-body localization in presence of cavity mediated long-range interactions

“…Such a model has been extensively studied in the past concentrating mainly, however, on ground state properties [25][26][27][28][29][30][31][32][33][34][35][36][37] (for a review with extensive list of references to earlier works see [38]. The certainly incomplete list of recent experimental works in that area includes [39][40][41][42]). Long-range interactions appear naturally in this system -the mode of the cavity mediates a two-body interaction whose range is as large as the system size.…”

Self-oscillating geometric pump in a dissipative atom-cavity system

“…A magnetic offset field of ∼ 25 G is applied to avoid spin-dependent effects on self-organization as e.g. superradiance to the orthogonally polarized cavity mode that is significantly detuned due to the birefringence of our cavity as we studied in [44].…”

“…Coupling the cavity field to a self-organised Mott insulator [39] or Fermi gas [40], the transported charge would be quantised and the cavity phase would directly reflect the topological index [41], realising a continuos dissipative topological time crystal. In addition, applying our scheme to spin-dependent self-organisation [42][43][44]…”