Principles of an Atomtronic Battery

TL;DR

This paper proposes and analyzes an atomtronic battery based on an asymmetric atom trap, modeling its behavior with an equivalent circuit to optimize power supply and understand limitations in atomtronic circuits.

Contribution

It introduces a novel model of an atomtronic battery using a Thévenin equivalent, linking trap parameters to power output and internal resistance.

Findings

Optimal input power exists for given trap parameters.

Internal resistance limits maximum power and influences noise.

Battery behavior can be effectively modeled with an equivalent circuit.

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 non-dissipative atom trap proposed by Roos et al.(Europhysics Letters V61, 187 (2003)). The trap is defined by longitudinal and transverse trap frequencies and corresponding trap energy heights. The battery's ability to supply power to a load is evaluated as a function of an input atom flux and power. For given trap parameters and input flux the battery is shown to have a resonantly optimum value of input power. 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 Th\'{e}venin 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 that noise will be imposed on the circuit. We argue that any means of implementing a battery for atomtronics can be represented by a Th\'{e}venin equivalent and that its performance will likewise be determined by an internal resistance.