Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 59: Quantum Gases (Bosons) VI
Q 59.5: Vortrag
Donnerstag, 8. März 2018, 11:30–11:45, K 2.020
supersolidity of lattice Bosons immersed in strongly correlated Rydberg dressed atoms — •Yongqiang Li1, Andreas Geißler2, Walter Hofstetter2, and Weibin Li3,4 — 1Department of Physics, National University of Defense Technology, Changsha 410073, P. R. China — 2Institut für Theoretische Physik, Goethe-Universität, 60438 Frankfurt/Main, Germany — 3School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK — 4Centre for the Mathematics and Theoretical Physics of Quantum Non-equilibrium Systems, University of Nottingham, Nottingham NG7 2RD, UK
Recent experiments have illustrated that long range two-body interactions can be induced by laser coupling atoms to highly excited Rydberg states. Stimulated by this achievement, we study supersolidity of lattice 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, generating 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 supersolids, where the bare species forms supersolid phases that are immersed in strongly correlated quantum phases, i.e. a crystalline solid or supersolid of the dressed atoms. We show that the interspecies interaction leads to a roton-like instability in the bare species and therefore is crucially important to the supersolid formation.