Bose-Fermi transmutation for one-dimensional harmonic trap

TL;DR

This study uses DMRG to explore ground state properties of 1D Bose-Fermi mixtures in optical lattices, revealing transmutation phenomena, density overlaps, and phase separation under various interaction conditions.

Contribution

It demonstrates Bose-Fermi transmutation and phase separation in 1D optical lattices, providing new insights into their ground state behaviors under different interactions.

Findings

Transmutation between bosonic and fermionic ground states at certain fillings.

Overlap of boson and fermion densities in Mott plateau.

Fermion expulsion from the trap center with strong interactions.

Abstract

Using Density Matrix renormalization group (DMRG), we study the ground state properties of spin one-half fermions and scalar bosons in the soft-core limit, with weak s-wave inter and intra species interactions. We considered the system subject to one-dimensional (1D) optical lattice and a superimposed potential at zero temperature, in the framework of Bose-Fermi-Hubbard model. We found that for certain fillings and interaction parameters, a transmutation occurs between the ground states of bosons and fermions when the densities are exchanged. We too report that the density distributions of bosons and fermions overlap with each other in a bosonic and fermionic Mott plateau, when the interaction parameters fulfill the relationship $U_{BB}>U_{BF}<U_{BF}$. We also find that the fermions are repelled out of the central region of the trap for sufficiently strong $U_{FF}$ interaction, exhibiting phase separation of Bose and Fermi components.