Dipolar Bosons in Triangular Optical Lattices: Quantum Phase Transitions and Anomalous Hysteresis

TL;DR

This paper investigates quantum phase transitions and unusual hysteresis behaviors in dipolar bosons within triangular optical lattices, revealing a first-order melting transition and unidirectional hysteresis caused by quantum fluctuations.

Contribution

It demonstrates that the supersolid to superfluid transition is first-order and exhibits anomalous, unidirectional hysteresis, contrasting previous findings and highlighting quantum fluctuation effects.

Findings

First-order quantum melting transition from supersolid to superfluid.

Presence of anomalous, non-standard hysteresis loops.

Transition occurs unidirectionally along the hysteresis curve.

Abstract

We study phase transitions and hysteresis in a system of dipolar bosons loaded into triangular optical lattices at zero temperature. We find that the quantum melting transition from supersolid to superfluid phase is first-order, in contrast with the previous report. We also find that due to strong quantum fluctuations the supersolid (or solid)-superfluid transition can exhibit an anomalous hysteretic behavior, in which the curve of density versus chemical potential does not form a standard loop structure. Furthermore, we show that the transition occurs unidirectionally along the anomalous hysteresis curve.