Emergent Weyl Nodes and Berry Curvature in Bose Polarons via $p$-Wave Feshbach Coupling

TL;DR

This paper predicts that Bose polarons in a Bose-Einstein condensate can exhibit topological features like Weyl nodes and Berry curvature induced by $p$-wave Feshbach resonance, leading to observable Hall effects.

Contribution

It introduces a novel topological characterization of Bose polarons through Weyl nodes and Berry curvature arising from $p$-wave interactions, without requiring spin-orbit coupling.

Findings

Weyl nodes emerge in Bose polarons via $p$-wave Feshbach resonance.

Bose polarons exhibit nonzero Berry curvature and topological properties.

Charged impurities show chiral anomaly effects.

Abstract

We show that an impurity quasiparticle immersed in a Bose-Einstein condensate, known as a Bose polaron, exhibits topological properties characterized by a nonzero Berry curvature, which is induced by Weyl nodes that emerge via interspecies $p$-wave Feshbach resonance. Such nodes occur even in the absence of spin degrees of freedom and spin-orbit coupling. For charged impurities, the corresponding $p$-wave polarons are shown to be accompanied by chiral anomaly. The above predictions can be tested in a cold atomic environment by observing the Hall transport of the atomic or ionic impurity cloud.