Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 52: Quantum Gases (Bosons) V

Q 52.4: Talk

Thursday, March 14, 2019, 14:45–15:00, S HS 037 Informatik

Metastable states of ultracold atomic gases in cavity quantum electrodynamics — •Lukas Himbert¹, Cecilia Cormick², Rebecca Kraus¹, Shraddha Sharma¹, and Giovanna Morigi¹ — ¹Theoretical Physics, Saarland University, Campus E2.6, D-66123 Saarbrücken, Germany — ²IFEG, CONICET and Universidad Nacional de Còrdoba, Ciudad Universitaria, X5016LAE Córdoba, Argentina

We investigate the stationary phases of the extended Bose-Hubbard model with infinite long-range interactions. This model describes ultracold bosonic atoms confined by a two-dimensional optical lattice and dispersively coupled to a cavity mode with the same wavelength as the lattice. The competition between tunneling, onsite interactions, and the long-range interactions mediated by the cavity photons gives rise to a rich ground-state phase diagram, which exhibits Mott-insulator, superfluid phases, lattice super solid, and matter-density waves. We perform a mean-field analysis of the grand-canonical ensemble and compare our analytical and numerical predictions for the ground state phase diagram with the results reported so far in the literature. We then determine the phase diagram for a class of incompressible metastable states as a function of the strength of the cavity-induced long-range interactions and discuss these findings in connection to the relaxation dynamics observed after quenches across the critical lines.