Rotation of supersolids in cold atomic condensates

Tie-Fu Zhang, Wei Han, Renyuan Liao +2 more

Massimo Boninsegni

Anonymous

Peter P. Orth, Doron L. Bergman, Karyn Le Hur

Rashi Sachdeva, Sankalpa Ghosh

Ultra cold atomic condensate with long range interaction is considered as a possible candidate to realize the supersolid phase. Such a supersolid phase can be subjected to artificial gauge field created either through rotation or by introducing space dependent coupling among hyperfine states of the atoms using Raman lasers. We study the effect of an artificial gauge field on the Supersolid phase in ultracold atomic condensates with long range interactions. Using Mean field approach, we demonstrate the structural differences between vortex in a supersolid and superfluid. We determine analytically the effect of the artificial gauge field on the density wave - supersolid (DW-SS) and the Mott insulator-superfluid (MI-SF) transition boundary. We also point out that in symmetric gauge the momentum distribution structure at these transition boundaries bears distinctive signatures of vortices in supersolid and superfluid phases. We point out that these results can clearly identify such a ultra cold atomic supersolid phase.

Sankalpa Ghosh, Rashi Sachdeva

Abstract Ultra cold atomic condensate with long range interaction is considered as a possible candidateto realize the supersolid phase. Such a supersolid phase can be subjected to arti cial gauge eldcreated either through rotation or by introducing space dependent coupling among hyper ne statesof the atoms using Raman lasers. We construct a Gross-Pitaevskii hydrodynamic theory to describethe low energy long wavelength excitations of such rotating supersolid of weakly interacting ultracold atoms for generic type of long range interaction. We treat the supersolid within the frameworkof well known two uid approximation. We consider such system in the fast rotation limit where avortex lattice in superuid coexists with the supersolid lattice and analytically obtain the dispersionrelations of collective excitations around this equilibrium state. The dispersion relation suggests amode splitting due to the existence of two lattices which can be experimentally measured within thecurrent technology. We point out that this can clearly identify such a ultra cold atomic supersolidphase.