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Journal Article

Driven-Dissipative Supersolid in a Ring Cavity


Piazza,  Francesco
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Mivehvar, F., Ostermann, S., Piazza, F., & Ritsch, H. (2018). Driven-Dissipative Supersolid in a Ring Cavity. Physical Review Letters, 120(12): 123601. doi:10.1103/PhysRevLett.120.123601.

Cite as: https://hdl.handle.net/21.11116/0000-0001-510A-9
Supersolids are characterized by the counterintuitive coexistence of superfluid and crystalline order. Here we study a supersolid phase emerging in the steady state of a driven-dissipative system. We consider a transversely pumped Bose-Einstein condensate trapped along the axis of a ring cavity and coherently coupled to a pair of degenerate counterpropagating cavity modes. Above a threshold pump strength the interference of photons scattered into the two cavity modes results in an emergent superradiant lattice, which spontaneously breaks the continuous translational symmetry towards a periodic atomic pattern. The crystalline steady state inherits the superfluidity of the Bose-Einstein condensate, thus exhibiting genuine properties of a supersolid. A gapless collective Goldstone mode correspondingly appears in the superradiant phase, which can be nondestructively monitored via the relative phase of the two cavity modes on the cavity output. Despite cavity-photon losses the Goldstone mode remains undamped, indicating the robustness of the supersolid phase.