Raman processes and effective gauge potentials

TL;DR

The paper introduces a novel method using light-induced gauge potentials to make ultra-cold neutral atoms mimic charged particles in magnetic fields, enabling the study of quantum phenomena like vortex lattices.

Contribution

It presents a new technique for creating effective magnetic fields for neutral atoms using laser fields and Zeeman shifts, applicable to multi-state atoms.

Findings

Successful modeling of vortex lattice formation in a 2D Bose-Einstein condensate

Demonstration of effective magnetic fields in ultra-cold atom systems

Potential for exploring quantum Hall effects with neutral atoms

Abstract

A new technique is described by which light-induced gauge potentials allow systems of ultra-cold neutral atoms to behave like charged particles in a magnetic field. Here, atoms move in a uniform laser field with a spatially varying Zeeman shift and experience an effective magnetic field. This technique is applicable for atoms with two or more internal ground states. Finally, an explicit model of the system using a single-mode 2D Gross-Pitaevskii equation yields the expected vortex lattice.