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Asymmetric arms maximize visibility in hot-electron interferometers

Lookup NU author(s): Dr Clarissa Barratt, Dr Clive Emary

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This is the final published version of an article that has been published in its final definitive form by American Physical Society, 2021.

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Abstract

© 2021 American Physical Society. We consider theoretically an electronic Mach-Zehnder interferometer constructed from quantum Hall edge channels and quantum point contacts, fed with single electrons from a dynamic quantum dot source. By considering the energy dependence of the edge-channel guide centers, we give an account of the phase averaging in this setup that is particularly relevant for the short, high-energy wave packets injected by this type of electron source. We present both analytic and numerical results for the energy-dependent arrival time distributions of the electrons and also give an analysis of the delay times associated with the quantum point contacts and their effects on the interference patterns. A key finding is that, contrary to expectation, maximum visibility requires the interferometer arms to be different in length, with an offset of up to a micron for typical parameters. By designing interferometers that incorporate this asymmetry in their geometry, phase-averaging effects can be overcome such that visibility is only limited by other incoherent mechanisms.

Publication metadata

Author(s): Barratt CJ, Ryu S, Clark LA, Sim H-S, Kataoka M, Emary C

Publication type: Article

Publication status: Published

Journal: Physical Review B

Year: 2021

Volume: 104

Issue: 3

Online publication date: 30/07/2021

Acceptance date: 13/07/2021

Date deposited: 24/08/2021

ISSN (print): 2469-9950

ISSN (electronic): 2469-9969

Publisher: American Physical Society

URL: https://doi.org/10.1103/PhysRevB.104.035436

DOI: 10.1103/PhysRevB.104.035436

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