An external coherent phase-locking drive opens a gap in the dispersion of collective excitations in a driven-dissipative condensate and reveals regions of finite-wavevector dynamical instability in the phase diagram.
Some analyt- ical considerations on the existence of multiple solutions at a givenI inc in a general ∆̸= 0 case are given in Ap- pendix A
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Opening a gap in the dispersion of the collective excitations of a driven-dissipative condensate subject to an external coherent drive
An external coherent phase-locking drive opens a gap in the dispersion of collective excitations in a driven-dissipative condensate and reveals regions of finite-wavevector dynamical instability in the phase diagram.