Retroreflection and diffraction of a Bose\u2013Einstein condensate by evanescent standing wave potential

Javed Akram,Khan Qasim,Lei Wei

doi:10.1038/s41598-020-77597-8

Javed Akram, Khan Qasim + Show 1 more

Open Access

https://doi.org/10.1038/s41598-020-77597-8

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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 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.

Highlights

The characteristic of the angular distributions of accelerated Bose–Einstein condensate (BEC) atoms incidence on the surface is designed using the mathematical modeling method
The dynamics of a quantum particle bouncing on a hard surface under the influence of gravity referred as a quantum bouncing ball (QBB)[13], is a notable example of a quantum mechanical system showing collapses and revivals of the QBB, which is a clear signature of quantum interference without classical c orrespondence[14]
During the interaction of atoms with surface, a good loading scheme and trap geometry become important for studying the dynamics of the BEC in gravito-optical surface trap (GOST)

Summary

Introduction

The characteristic of the angular distributions of accelerated Bose–Einstein condensate (BEC) atoms incidence on the surface is designed using the mathematical modeling method. The dynamics of a quantum particle bouncing on a hard surface under the influence of gravity referred as a quantum bouncing ball (QBB)[13], is a notable example of a quantum mechanical system showing collapses and revivals of the QBB, which is a clear signature of quantum interference without classical c orrespondence[14] This kind of system open the opportunities to study the dynamics of atoms in the modulated evanescent wave (EW), such as localization[15,16] or a coherent a cceleration[17,18] of atoms, strongly depending on the system parameters and on the chosen initial condensations, which is signature of chaos in this kind of system.

Methods

Conclusion