Dysprosium dipolar Bose-Einstein condensate with broad Feshbach resonances

TL;DR

This paper reports the creation of dysprosium Bose-Einstein condensates using a novel optical trapping method, characterizes their scattering properties, and identifies broad Feshbach resonances to facilitate studies of dipolar quantum phenomena.

Contribution

Introduces an efficient technique for producing dysprosium BECs and identifies broad Feshbach resonances, enabling advanced exploration of dipolar quantum effects.

Findings

Successful production of dysprosium BECs with a resonator-enhanced optical trap.

Discovery of two isolated broad Feshbach resonances at 22 G and 27 G.

Resonances characterized as predominantly s-wave, aiding future quantum studies.

Abstract

We produce Bose-Einstein condensates of $^{162}$Dy atoms employing an innovative technique based on a resonator-enhanced optical trap that allows efficient loading from the magneto-optical trap and fast evaporation. We characterize the scattering properties of the ultracold atoms for magnetic fields between 6 and 30 G. In addition to the typical chaotic distribution of narrow Feshbach resonances in Lanthanides, we discover two rather isolated broad features at around 22 G and 27 G. A characterization using the complementary measurements of losses, thermalization, anisotropic expansion and molecular binding energy points towards resonances of predominant s-wave character. Such resonances will ease the investigation of quantum phenomena relying on the interplay between dipole and contact interactions.