Feshbach modulation spectroscopy

TL;DR

This paper proposes a novel Feshbach modulation spectroscopy method to study ultracold atoms near Feshbach resonances, enabling insights into molecule formation and lattice dynamics beyond traditional models.

Contribution

It introduces a magnetic field modulation technique across Feshbach resonances as an alternative to lattice-depth modulation spectroscopy, with simulation data supporting its effectiveness.

Findings

Simulation data demonstrate the method's potential for probing molecule dynamics.

The approach offers an efficient pathway for ultracold molecule creation.

It extends spectroscopy techniques beyond the single-band Hubbard model.

Abstract

In the vicinity of a Feshbach resonance, a system of ultracold atoms on an optical lattice undergoes rich physical transformations which involve molecule formation and hopping of molecules on the lattice and thus goes beyond a single-band Hubbard model description. We propose to probe the behavior of this system with a harmonic modulation of the magnetic field, and thus of the scattering length, across the Feshbach resonance, as an alternative to lattice-depth modulation spectroscopy. In the regime in which the single-band Hubbard model is still valid, we provide simulation data for this type of spectroscopy. The method may uncover a route towards the efficient creation of ultracold molecules and provides an alternate means for lattice modulation spectroscopy.