Self-interfering dynamics in Bose-Einstein condensates with engineered dispersions

TL;DR

This paper uncovers a self-interfering behavior in noninteracting Bose-Einstein condensates caused by engineered dispersions via optical lattice or spin-orbit coupling, explained through Wigner distribution analysis.

Contribution

It demonstrates a novel self-interfering phenomenon in BECs with engineered dispersion, providing detailed characterization and physical explanation.

Findings

Self-interference arises from co-occupation of positive and negative effective mass regimes.

The phenomenon is explained using the Wigner distribution function.

Detailed features of the interference pattern are characterized.

Abstract

Optical lattice and spin-orbit coupling are typical experimental approaches to engineer dispersion. We reveal a self-interfering dynamics in a noninteracting Bose-Einstein condensate with the engineered dispersion by optical lattice or spin-orbit coupling. The self-interference results from the co-occupation of positive and negative effect mass regimes in the engineered dispersion. The physical origination of the self-interference is explained by the Wigner distribution function of the self-interfering wave-packet. We characterize detail features of the self-interference pattern.