Phase separated charge density wave phase in two species extended Bose-Hubbard model

TL;DR

This paper investigates quantum phase transitions in a two-species extended Bose-Hubbard model on a 1D lattice, revealing a phase separated charge density wave phase under certain interaction conditions.

Contribution

It introduces the existence of a phase separated charge density wave phase in a two-species extended Bose-Hubbard model using DMRG calculations.

Findings

Identification of phase transitions at integer filling

Discovery of phase separated charge density wave order

Conditions for PSCDW phase based on interaction strengths

Abstract

We study the quantum phase transitions in a two component bose-mixture in a one-dimensional optical lattice. The calculations have been performed in the framework of the extended Bose-Hubbard model using the finite size density matrix renormalization group method. We obtain different phase transitions for the system for integer filling. When the inter-species on-site and the nearest neighbor interactions are larger than the intra-species on-site and also the nearest neighbor interactions, the system exhibits a phase separated charge density wave (PSCDW) order that is characterized by the two species being spatially separated and existing in the density wave phases.