Supersolid of Hardcore Bosons on the Face Centered Cubic Lattice

TL;DR

This paper explores the existence and characteristics of a supersolid phase in hardcore boson models on the FCC lattice, using quantum Monte Carlo simulations to map out the phase diagram and analyze the coexistence of order and superfluidity.

Contribution

It provides the first detailed quantum Monte Carlo study of supersolidity in hardcore bosons on the FCC lattice, revealing the phase diagram and underlying mechanisms.

Findings

Supersolid phase exists at intermediate fillings.

Phase diagram includes solid, supersolid, and superfluid regions.

Mechanism of supersolidity discussed in context of FCC lattice.

Abstract

We investigate a supersolid state in hardcore boson models on the face-centered-cubic (FCC) lattice. The supersolid state is characterized by a coexistence of crystalline order and superfluidity. Using a quantum Monte Carlo method based on the directed-loop algorithm, we calculate static structure factors and superfluid density at finite temperature, from which we obtain the phase diagram. The supersolid phase exists at intermediate fillings between a three-quarter-filled solid phase and a half-filled solid phase. We also discuss the mechanism of the supersolid state on the FCC lattice.