Macri, Tommaso

Date:    Thursday, Oct 7, 2021
Time:   16:30
Place:   ETH Zurich, Campus Hönggerberg, HPF G 6 & scheduled Zoom meeting
Host:    Tobias Donner

Quantum and thermal stability of quasiperiodic patterns of ultracold Bose gases

Tommaso Macrì
Universidade Federal do Rio Grande do Norte, Brasil

The search for spontaneous pattern formation in equilibrium phases with genuine quantum properties is a leading direction of current research. We investigate the effect of quantum fluctuations - zero point motion and exchange interactions - on the phases of an ensemble of bosonic particles with local and nonlocal interactions via path-integral Monte Carlo simulations to determine their ground state properties. In the high-density limit we observe patterns with 12-fold rotational symmetry compatible with periodic approximants of quasicrystalline phases. In the second part, I present results for a system of 2D trapped bosons in a quasiperiodic potential at finite temperature. Alongside the superfluid, normal fluid and insulating phases, we demonstrate the existence of a Bose glass phase, which is found to be robust to thermal fluctuations for a set of parameters within reach of current experiments with quasi-2D optical confinement.