Feshbach Resonance Induced Fano Interference in Photoassociation

TL;DR

This paper investigates how Feshbach resonances influence Fano interference in photoassociation, revealing that certain spectral features are independent of laser intensity while others depend explicitly, and explores nonlinear effects.

Contribution

It introduces the analysis of Fano interference in photoassociation near Feshbach resonances, highlighting the intensity independence of the minimum and the potential for nonlinear effects.

Findings

Minimum in photoassociation profile is independent of laser intensity.

Maximum in photoassociation profile depends explicitly on laser intensity.

Potential for nonlinear Fano effects near Feshbach resonances.

Abstract

We consider photoassociation from a state of two free atoms when the continuum state is close to a magnetic field induced Feshbach resonance and analyze Fano interference in photoassociation. We show that the minimum in photoassociation profiles characterized by the Fano asymmetry parameter $q$ is independent of laser intensity, while the maximum explicitly depends on laser intensity. We further discuss the possibility of nonlinear Fano effect in photoassociation near a Feshbach resonance.