Coherent tunnelling across a quantum point contact in the quantum Hall regime

The unique properties of quantum hall devices arise from the ideal one-dimensional edge states that form in a two-dimensional electron system at high magnetic field. Tunnelling between edge states across a quantum point contact (QPC) has already revealed rich physics, like fractionally charged excit...

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Main Authors:	Martins, F., Faniel, S., Rosenow, B., Sellier, H., Huant, S., Pala, M. G., Desplanque, L., Wallart, X., Bayot, V., Hackens, B.
Format:	Online
Language:	English
Published:	Nature Publishing Group 2013
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3593222/

id	pubmed-3593222
recordtype	oai_dc
spelling	pubmed-35932222013-03-11 Coherent tunnelling across a quantum point contact in the quantum Hall regime Martins, F. Faniel, S. Rosenow, B. Sellier, H. Huant, S. Pala, M. G. Desplanque, L. Wallart, X. Bayot, V. Hackens, B. Article The unique properties of quantum hall devices arise from the ideal one-dimensional edge states that form in a two-dimensional electron system at high magnetic field. Tunnelling between edge states across a quantum point contact (QPC) has already revealed rich physics, like fractionally charged excitations, or chiral Luttinger liquid. Thanks to scanning gate microscopy, we show that a single QPC can turn into an interferometer for specific potential landscapes. Spectroscopy, magnetic field and temperature dependences of electron transport reveal a quantitatively consistent interferometric behavior of the studied QPC. To explain this unexpected behavior, we put forward a new model which relies on the presence of a quantum Hall island at the centre of the constriction as well as on different tunnelling paths surrounding the island, thereby creating a new type of interferometer. This work sets the ground for new device concepts based on coherent tunnelling. Nature Publishing Group 2013-03-11 /pmc/articles/PMC3593222/ /pubmed/23475303 http://dx.doi.org/10.1038/srep01416 Text en Copyright © 2013, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by/3.0/ This work is licensed under a Creative Commons Attribution 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Martins, F. Faniel, S. Rosenow, B. Sellier, H. Huant, S. Pala, M. G. Desplanque, L. Wallart, X. Bayot, V. Hackens, B.
spellingShingle	Martins, F. Faniel, S. Rosenow, B. Sellier, H. Huant, S. Pala, M. G. Desplanque, L. Wallart, X. Bayot, V. Hackens, B. Coherent tunnelling across a quantum point contact in the quantum Hall regime
author_facet	Martins, F. Faniel, S. Rosenow, B. Sellier, H. Huant, S. Pala, M. G. Desplanque, L. Wallart, X. Bayot, V. Hackens, B.
author_sort	Martins, F.
title	Coherent tunnelling across a quantum point contact in the quantum Hall regime
title_short	Coherent tunnelling across a quantum point contact in the quantum Hall regime
title_full	Coherent tunnelling across a quantum point contact in the quantum Hall regime
title_fullStr	Coherent tunnelling across a quantum point contact in the quantum Hall regime
title_full_unstemmed	Coherent tunnelling across a quantum point contact in the quantum Hall regime
title_sort	coherent tunnelling across a quantum point contact in the quantum hall regime
description	The unique properties of quantum hall devices arise from the ideal one-dimensional edge states that form in a two-dimensional electron system at high magnetic field. Tunnelling between edge states across a quantum point contact (QPC) has already revealed rich physics, like fractionally charged excitations, or chiral Luttinger liquid. Thanks to scanning gate microscopy, we show that a single QPC can turn into an interferometer for specific potential landscapes. Spectroscopy, magnetic field and temperature dependences of electron transport reveal a quantitatively consistent interferometric behavior of the studied QPC. To explain this unexpected behavior, we put forward a new model which relies on the presence of a quantum Hall island at the centre of the constriction as well as on different tunnelling paths surrounding the island, thereby creating a new type of interferometer. This work sets the ground for new device concepts based on coherent tunnelling.
publisher	Nature Publishing Group
publishDate	2013
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3593222/
_version_	1611961133797736448

Coherent tunnelling across a quantum point contact in the quantum Hall regime

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