A strongly interacting high partial wave Bose gas

TL;DR

This paper investigates p- and d-wave resonant Bose gases, analyzing their phase diagrams, quasi-bound states, and atom-dimer conversions, providing new insights into high partial wave interactions beyond s-wave cases.

Contribution

It introduces a detailed analysis of high partial wave Bose gases using a two-channel model and predicts a multi-critical point in the phase diagram.

Findings

Identification of a quasi-bound state in high partial wave interactions.

Prediction of a multi-critical point in the phase diagram.

Observation of resonant atom-dimer conversion near the quasi-bound energy.

Abstract

Motivated by recent experimental progress, we make an investigation of p- and d-wave resonant Bose gas. An explantation of the Nozieres and Schmitt-Rink (NSR) scheme in terms of two-channel model is provided. Different from the s-wave case, high partial wave interaction supports a quasi-bound state in the weak coupling regime. Within the NSR approximation, we study the equation of state, critical temperature and particle population distributions. We clarify the effect of the quasi-bound state on the phase diagram and the dimer production. A multi-critical point where normal phase, atomic superfluid phase and molecular superfluid phase meet is predicted within the phase diagram. We also show the occurrence of a resonant conversion between solitary atoms and dimers when temperature kBT approximates the quasi-bound energy.