Pair Superfluid and Supersolid of Correlated Hard-Core Bosons on a Triangular Lattice

TL;DR

This paper investigates the phase diagram of correlated hard-core bosons on a triangular lattice, revealing the existence of supersolid and pair superfluid phases and a continuous quantum phase transition between them.

Contribution

It provides a systematic study of the hard-core Bose-Hubbard model with correlated hopping, identifying novel phases and phase transitions using density-matrix renormalization group methods.

Findings

Identification of supersolid and pair superfluid phases.

Discovery of a continuous quantum phase transition between these phases.

Detailed phase diagram of the correlated boson system.

Abstract

We have systematically studied the hard-core Bose-Hubbard model with correlated hopping on a triangular lattice using density-matrix renormalization group method. A rich ground state phase diagram is determined. In this phase diagram there is a supersolid phase and a pair superfluid phase due to the interplay between the ordinary frustrated boson hopping and an unusual correlated hopping. In particular, we find that the quantum phase transition between the supersolid phase and the pair superfluid phase is continuous.