2019/01/17 by Nishant Dogra, Manuele Landini, Katrin Kroeger +3 · 2 citations
Physics and Astronomy · #cond-mat.quant-gas
paper · pdf · doi:10.1126/science.aaw4465
13 pages including supplementary information
arxiv created 2019/01/17 · arxiv updated 2020/02/19
Dissipative and unitary processes define the evolution of a many-body system. Their interplay gives rise to dynamical phase transitions and can lead to instabilities. We discovered a non-stationary state of chiral nature in a synthetic many-body system with independently controllable unitary and dissipative couplings. Our experiment is based on a spinor Bose gas interacting with an optical resonator. Orthogonal quadratures of the resonator field coherently couple the Bose-Einstein condensate to two different atomic spatial modes whereas the dispersive effect of the resonator losses mediates a dissipative coupling between these modes. In a regime of dominant dissipative coupling we observe the chiral evolution and map it to a positional instability.