Ultracold bosons in the vicinity of a narrow resonance: shallow dimer and recombination

TL;DR

This paper analyzes the behavior of ultracold bosons near narrow Feshbach resonances, focusing on shallow dimers and recombination rates, using a two-channel model to derive an approximate law for three-body recombination.

Contribution

It introduces a detailed analysis of narrow Feshbach resonances in ultracold bosons, deriving an approximate law for three-body recombination including background scattering.

Findings

Identification of resonant regimes with shallow dimers

Derivation of an approximate recombination law including background effects

Insights into three-body processes near narrow resonances

Abstract

The different resonant regimes that can be achieved by using a magnetic Feshbach resonance are analyzed with a separable two-channel model. Emphasis is put on the case of narrow resonances in a region of intermediate detuning where a shallow dimer exists and an approximate law including the background scattering length for the three-body recombination rate is derived.