2017/05/31 by Vincenzo Savona · 2 citations
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Dissipative system #Lattice (music) #Nonlinear Photonic Systems #Nonlinear system #Phase (matter) #Phase diagram #Phase transition #Physics #Quantum electrodynamics #Quantum mechanics #Spontaneous symmetry breaking #Strong Light-Matter Interactions #Symmetry breaking #quant-ph
paper · pdf · doi:10.1103/physreva.96.033826
published as Phys. Rev. A 96, 033826 (2017) · 7 pages, 3 figures, version accepted for publication
openalex publication_date 2017/09/13 · arxiv created 2017/09/19 · arxiv updated 2017/09/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the occurrence of a phase transition, characterized by the spontaneous breaking of a discrete symmetry, in a driven-dissipative Bose-Hubbard lattice in the presence of two-photon coherent driving. The driving term does not lift the original U(1) symmetry completely and a discrete ℤ2 symmetry is left. When driving the bottom of the Bose-Hubbard band, a mean-field analysis of the steady state reveals a second-order transition from a symmetric phase to a quasicoherent state with a finite expectation value of the Bose field. For larger driving frequency, the phase diagram shows a third region, where both phases are stable and the transition becomes of first order.