Retroreflection and diffraction of a Bose-Einstein condensate by evanescent standing wave potential

TL;DR

This paper models how Bose-Einstein condensates interact with an evanescent standing wave potential, demonstrating retroreflection and diffraction effects that could be used for surface analysis and sensing applications.

Contribution

It introduces a mathematical model for BEC interactions with an evanescent standing wave, revealing retroreflection and diffraction phenomena with potential sensing applications.

Findings

Development of a mathematical model for BEC-ESWP interaction

Observation of density rainbow patterns due to interference

Potential applications in surface structure analysis and high-resolution sensing

Abstract

The characteristic of the angular distributions of accelerated Bose-Einstein condensate (BEC) atoms incidence on the surface is designed using the mathematical modeling method. Here, we proposed the idea to study the retroreflection and diffraction of a BEC from an evanescent standing wave potential (ESWP). The ESWP is formed by multiple reflections of the laser beam from the surface of the prism under the influence of gravity. After BEC's reflection and diffraction, the so-called BEC's density rainbow patterns develop due to the interference which depends on the surface structure which we model with the periodic decaying evanescent field. The interaction of accelerated bosonic atoms with a surface can help to demonstrate surface structures or to determine surface roughness, or to build future high spatial resolution and high sensitivity magnetic-field sensors in two-dimensional systems.