Exotic phase separation in one-dimensional hard-core boson system with two- and three-body interactions

TL;DR

This paper explores a one-dimensional hard-core boson system with competing two- and three-body interactions, revealing an exotic phase separation regime between solid and superfluid phases through numerical analysis.

Contribution

It identifies and characterizes a novel phase separation regime in a 1D bosonic system with specific interactions, using advanced numerical methods.

Findings

Existence of an exotic phase separation regime

Identification of phases via density and correlation analysis

Potential observation in ultra-cold polar molecule experiments

Abstract

We investigate the ground state phase diagram of hard-core boson system with repulsive two-body and attractive three-body interactions in one-dimensional optic lattice. When these two interactions are comparable and increasing the hopping rate, physically intuitive analysis indicates that there exists an exotic phase separation regime between the solid phase with charge density wave order and superfluid phase. We identify these phases and phase transitions by numerically analyzing the density distribution, structure factor of density-density correlation function, three-body correlation function and von Neumann entropy estimator obtained by density matrix renormalization group method. These exotic phases and phase transitions are expected to be observed in the ultra-cold polar molecule experiments by properly tuning interaction parameters, which is constructive to understand the physics of ubiquitous insulating-superconducting phase transitions in condensed matter systems.