Principles of an atomtronic battery

Alex A. Zozulya and Dana Z. Anderson
Phys. Rev. A 88, 043641 – Published 29 October 2013

Abstract

An asymmetric atom trap is investigated as a means to implement a “battery” that supplies ultracold atoms to an atomtronic circuit. The battery model is derived from a scheme for continuous loading of a nondissipative atom trap proposed by Roos et al. [C. F. Roos, P. Cren, D. Guery-Odelin, and J. Dalibard, Europhys. Lett. 61, 187 (2003)]. The trap is defined by longitudinal and transverse trap frequencies fz and f and corresponding trap energy heights Uz and U. The battery's ability to supply power to a load is evaluated as a function of an input atom flux and power, Iin and Pin=Iin(1+ε)Uz, respectively, where ε is an excess fractional energy. For given trap parameters, the battery is shown to have a resonantly optimum value of ε. The battery behavior can be cast in terms of an equivalent circuit model; specifically, for fixed input flux and power the battery is modeled in terms of a Thévenin equivalent chemical potential and internal resistance. The internal resistance establishes the maximum power that can be supplied to a circuit, the heat that will be generated by the battery, and the noise that will be imposed on the circuit. We argue that any means of implementing a battery for atomtronics can be represented by a Thévenin equivalent and that its performance will likewise be determined by an internal resistance.

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  • Received 8 August 2013

DOI:https://doi.org/10.1103/PhysRevA.88.043641

©2013 American Physical Society

Authors & Affiliations

Alex A. Zozulya*

  • Department of Physics, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts 01609, USA

Dana Z. Anderson

  • Department of Physics and JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA

  • *zozulya@wpi.edu

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Vol. 88, Iss. 4 — October 2013

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