Sign reversal of the boson-boson interaction potential in planar Bose-Fermi mixtures under a synthetic magnetic field

TL;DR

This paper investigates how a synthetic magnetic field can reverse the sign of the effective interaction between bosons in a Bose-Fermi mixture, revealing complex dynamics in the quantum-Hall regime.

Contribution

It demonstrates the phenomenon of sign reversal of boson-boson interactions under a synthetic magnetic field in planar Bose-Fermi mixtures, highlighting nontrivial quantum-Hall regime dynamics.

Findings

Interaction sign oscillates due to magnetic field effects

Effective interactions can switch from repulsive to attractive

Quantum-Hall regime exhibits complex behavior

Abstract

We study the mutually coupled, strongly interacting bosonic and non-interacting fermionic, species of unequal masses in the regime were the retardation effects are an important part of the physics. A cloud of neutral atoms experiences a synthetic magnetic field because of a vector potential that imposes a phase shift on the constituents. The magnetic field causes the oscillations of the magnitude and sign of the effective interaction between bosons from repulsive to attractive in contrast to the static case. We show that the dynamics for the gaseous Bose-Fermi mixtures when reaching the quantum-Hall regime becomes highly nontrivial.