Mixing-Demixing transition in 1D boson-fermion mixture at low fermion densities

TL;DR

This study numerically explores how varying fermion density influences the transition between mixed and demixed phases in a one-dimensional boson-fermion lattice system, revealing that fewer fermions promote demixing.

Contribution

It provides the first detailed phase diagram showing the relationship between fermion density and mixing-demixing transition in 1D boson-fermion mixtures.

Findings

Decreasing fermion number induces demixing.

Phase diagram maps the transition boundary.

Fermion density below boson density favors demixing.

Abstract

We numerically investigated the mixing-demixing transition of the boson-fermion mixture on a 1D lattice at an incommensurate filling with the fermion density being kept below the boson density. The phase diagram we obtained suggested that the decrease of the number of the fermions drove the system into the demixing phase.