Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

OSA Quantum 2.0 Conference

Producing smooth flow in atom circuits by stirring

Ben Eller, Charles W. Clark, Mark Edwards

Published Jan 1, 2020• 0 citations
Publisher

Abstract

We have studied the efficacy of stirring a Bose–Einstein condensate confined in a racetrack atom circuit to produce neutral–atom flow. We also investigated the mechanism by which flow is produced.
DOI
10.1364/quantum.2020.qth7a.18

Related papers

Producing flow in a ``racetrack'' Bose-Einstein condensate atomtronic circuit

Ben Eller, Brennan Coheleach, Charles W. Clark +1 more

Bulletin of the American Physical Society•Mar 13, 2017•0 citations

Producing smooth flow in atom circuits by stirring

Olatunde Oladehin

•Jan 1, 2018•1 citation

On-demand Smooth Flow by Stirring a Racetrack Atom Circuit

Olatunde Oladehin, Benjamin Eller, Charles W. Clark +1 more

Bulletin of the American Physical Society•Mar 6, 2018•0 citations

Producing flow in racetrack atom circuits by stirring

Benjamin Eller, Olatunde Oladehin, Daniel Fogarty +3 more

We present a study of how macroscopic flow can be produced in Bose-Einstein condensates confined in a ``racetrack'' potential by stirring with a wide rectangular barrier. This potential consists of two half-circle channels separated by straight channels of length $L$ and reduces to a ring potential if $L=0$. We present the results of a flow-production study where racetrack condensates were stirred with a barrier under varying conditions of barrier height, stir speed, racetrack geometry, and temperature. The result was that stirring was readily able to produce flow in ring and nonring geometries but that the exact amount of flow produced depended on all of the study parameters. We therefore investigated the mechanism by which flow was produced in the stirring process. The basic mechanism that we discovered was that when the sweeping barrier potential height reached a critical value a series of phase slip (i.e., a sudden change in the phase winding around the condensate midtrack) events occurred. Phase slipping stopped when the flow produced overtook the speed of the stirring barrier. Disturbances generated at each phase slip circulated around the channel and served to convert the initially localized velocity distribution into smooth macroscopic flow. This picture of the mechanism for making flow should facilitate the design of closed-channel atom circuits for creating a desired amount of quantized smooth flow on demand.

arXiv:2004.04829•Physical Review A•Dec 21, 2020•10 citations

Finite-temperature Effects on Producing Smooth Flow in a Racetrack Atom Circuit

Benjamin Eller, Olatunde Oladehin, Charles W. Clark +1 more

Bulletin of the American Physical Society•Mar 6, 2018•0 citations

Producing Smooth Flow in a Racetrack Atom Circuit at Zero and Non-zero Temperature

Benjamin Eller

•Jan 1, 2018•0 citations
We present a study of how macroscopic flow can be produced in Bose-Einstein condensates confined in a ``racetrack'' potential by stirring with a wide rectangular barrier. This potential consists of two half-circle channels separated by straight channels of length LLL and reduces to a ring potential if L=0L=0L=0. We present the results of a flow-production study where racetrack condensates were stirred with a barrier under varying conditions of barrier height, stir speed, racetrack geometry, and temperature. The result was that stirring was readily able to produce flow in ring and nonring geometries but that the exact amount of flow produced depended on all of the study parameters. We therefore investigated the mechanism by which flow was produced in the stirring process. The basic mechanism that we discovered was that when the sweeping barrier potential height reached a critical value a series of phase slip (i.e., a sudden change in the phase winding around the condensate midtrack) events occurred. Phase slipping stopped when the flow produced overtook the speed of the stirring barrier. Disturbances generated at each phase slip circulated around the channel and served to convert the initially localized velocity distribution into smooth macroscopic flow. This picture of the mechanism for making flow should facilitate the design of closed-channel atom circuits for creating a desired amount of quantized smooth flow on demand.