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arXiv · 1410.5735

Nonequilibrium Phase Transition of Interacting Bosons in an Intra-Cavity Optical Lattice

M. Reza Bakhtiari·Andreas Hemmerich·Helmut Ritsch·Michael Thorwart
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Abstract

We investigate the nonlinear light-matter interaction of a Bose-Einstein condensate trapped in an external periodic potential inside an optical cavity which is weakly coupled to vacuum radiation modes and driven by a transverse pump field. Based on a generalized Bose-Hubbard model which incorporates a single cavity mode, we include the collective backaction of the atoms on the cavity light field and determine the nonequilibrium quantum phases within the nonperturbative bosonic dynamical mean-field theory.With the system parameters adapted to recent experiments, we find a quantum phase transition from a normal phase to a self-organized superfluid phase, which is related to the Hepp-Lieb-Dicke superradiance phase transition. For even stronger pumping, a self-organized Mott insulator phase arises.

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M. Reza Bakhtiari, Andreas Hemmerich, Helmut Ritsch, Michael Thorwart. 2015-03-25. Nonequilibrium Phase Transition of Interacting Bosons in an Intra-Cavity Optical Lattice. https://doi.org/10.1103/physrevlett.114.123601

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