Mott Plateau in Trapped Bose-Fermi Mixture

TL;DR

This paper investigates the formation of a Mott-plateau state in a trapped Bose-Fermi mixture on an optical lattice, revealing unique properties where particles can exchange positions within the plateau.

Contribution

It introduces the concept of a Mott-plateau in Bose-Fermi mixtures and demonstrates its formation and properties using Monte Carlo simulations.

Findings

Mott-plateau behavior observed in density profiles

Bosons and fermions can exchange positions within the plateau

Total particle number per site remains integer

Abstract

Boson-Fermion mixture confined on an optical lattice is numerically studied. Mott-plateau like behavior is observed under certain conditions in the density profile of the bosons and fermions as one sees in bosonic atoms in a trap potential. In the Mott plateau area, the total number of the bosons and fermions at each site is kept to an integer value but both local density of the bosons and that of the fermions take some intermediate values. Unlike bosonic or fermionic Mott insulators, the bosons and fermions can move even in the Mott plateau area by exchanging their positions. With Monte Carlo simulations we demonstrate the formation of the Mott plateau, examine the property of the bosons and fermions by measuring the densities and local density fluctuations, and give discussion on this rather new state.