Subject：Supersolidity of lattice Bosons immersed in strongly correlated Rydberg dressed atoms
Speaker：Ass.Prof. Weibin Li
Emcee：Prof. Guoxiang Huang
Time：11:00am, 25th Jan, 2018
Place：Science Building A814
Abstract：
Recent experiments have illustrated that long range two-body interac- tions can be induced by laser coupling atoms to highly excited Rydberg states. Stimulated by this achievement, we study supersolidity of lat- tice bosons in an experimentally relevant situation. In our setup, we consider two-component atoms on a square lattice, where one species is weakly dressed to an electronically high-lying (Rydberg) state, gen- erating a tunable, soft-core shape long-range interaction. Interactions between atoms of the second species and between the two species are characterized by local inter- and intra-species interactions. Using a dynamical mean-field calculation, we find two distinctive types of su- persolids, where the bare species forms supersolid phases that are im- mersed in strongly correlated quantum phases, i.e. a crystalline solid or supersolid of the dressed atoms. We show that the interspecies inter- action leads to a roton-like instability in the bare species and therefore is crucially important to the supersolid formation.
