Regensburg 2019 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 22: Critical Phenomena and Phase Transitions

DY 22.3: Vortrag

Dienstag, 2. April 2019, 14:30–14:45, H19

Phase diagram of lattice bosons with cavity-mediated long-range interactions with uncorrelated disorder — Chao Zhang and •Heiko Rieger — Theoretical Physics, Saarland University, Campus E2 6, Saarbrücken, 66123, Germany

Recent experiments with ultra-cold atoms in an optical lattice have realized cavity-mediated global range and observed the emergence of a supersolid and a density wave phase in addition to Mott insulator and superfluid phases. Here we consider theoretically the effect of uncorrelated disorder on the phase diagram of this system and study the two-dimensional Bose-Hubbard model with global range interactions and uncorrelated diagonal disorder. With the help of quantum Monte Carlo simulations using the Worm algorithm, we determine the phase diagram of this model. We show that two kinds of Bose glass phases exist: one with and one without density wave order and discuss the nature of the various phase transitions that occur.