Effect of non-Markovian dephasing bath on Dicke phase transition

We study the zero temperature Dicke superradiant phase transition when each atom is coupled to an individual non-Markovian dephasing bath. By using tensor network methods, we find out that, in contrast to previous studies where the Markovian bath completely destroys the superradiant phase transition, non-Markovianity of the bath can restore the phase transition. We numerically extract the critical couplings associated with the superradiant phase transition.