Implementation of an atomtronic SQUID in a strongly confined toroidal condensate

authored by: Hannes Kiehn, Vijay Pal Singh, Ludwig Mathey
Abstract: We investigate the dynamics of an atomtronic superconducting quantum interference device (SQUID) created by two mobile barriers, moving at two different, constant velocities in a quasi-one-dimensional toroidal condensate. We implement a multiband truncated Wigner approximation numerically to demonstrate the functionality of a SQUID reflected in the oscillatory voltage-flux dependence. The relative velocity of the two barriers results in a chemical potential imbalance analogous to a voltage in an electronic system. The average velocity of the two barriers corresponds to a rotation of the condensate, analogous to a magnetic flux. We demonstrate that the voltage equivalent shows characteristic flux-dependent oscillations. We point out the parameter regime of barrier heights and relaxation times for the phase slip dynamics, resulting in a realistic protocol for atomtronic SQUID operation.
Organisation(s): QuantumFrontiers
External Organisation(s): Universität Hamburg
Type: Article
Journal: Physical Review Research
Volume: 4
ISSN: 2643-1564
Publication date: 11.07.2022
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Physics and Astronomy(all)
Electronic version(s): https://doi.org/10.1103/PhysRevResearch.4.033024 (Access: Open)

BibTeX

@article{86129194afd348a09a80337630a53a10,
title = "Implementation of an atomtronic SQUID in a strongly confined toroidal condensate",
abstract = "We investigate the dynamics of an atomtronic superconducting quantum interference device (SQUID) created by two mobile barriers, moving at two different, constant velocities in a quasi-one-dimensional toroidal condensate. We implement a multiband truncated Wigner approximation numerically to demonstrate the functionality of a SQUID reflected in the oscillatory voltage-flux dependence. The relative velocity of the two barriers results in a chemical potential imbalance analogous to a voltage in an electronic system. The average velocity of the two barriers corresponds to a rotation of the condensate, analogous to a magnetic flux. We demonstrate that the voltage equivalent shows characteristic flux-dependent oscillations. We point out the parameter regime of barrier heights and relaxation times for the phase slip dynamics, resulting in a realistic protocol for atomtronic SQUID operation.",
author = "Hannes Kiehn and Singh, {Vijay Pal} and Ludwig Mathey",
note = "Funding Information: We thank Kevin Wright, Luigi Amico, and Giacomo Roati for insightful discussions. This work is supported by the Deutsche Forschungsgemeinschaft (DFG) in the framework of SFB 925 - Project No. 170620586 and the excellence cluster “Advanced Imaging of Matter” - EXC 2056 - Project No. 390715994, and the Cluster of Excellence “QuantumFrontiers” - EXC 2123 - Project No. 390837967.",
year = "2022",
month = jul,
day = "11",
doi = "10.1103/PhysRevResearch.4.033024",
language = "English",
volume = "4",
journal = "Physical Review Research",
issn = "2643-1564",
publisher = "American Physical Society",
number = "3",
}