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Martins F, Faniel S, Rosenow B, et al. Coherent tunnelling across a quantum point contact in the quantum Hall regime. Sci Rep. 2013;3:1416doi: 10.1038/srep01416.
Martins, F., Faniel, S., Rosenow, B., Sellier, H., Huant, S., Pala, M. G., Desplanque, L., Wallart, X., Bayot, V., & Hackens, B. (2013). Coherent tunnelling across a quantum point contact in the quantum Hall regime. Scientific reports, 31416. https://doi.org/10.1038/srep01416
Martins, F, et al. "Coherent tunnelling across a quantum point contact in the quantum Hall regime." Scientific reports vol. 3 (2013): 1416. doi: https://doi.org/10.1038/srep01416
Martins F, Faniel S, Rosenow B, Sellier H, Huant S, Pala MG, Desplanque L, Wallart X, Bayot V, Hackens B. Coherent tunnelling across a quantum point contact in the quantum Hall regime. Sci Rep. 2013;3:1416. doi: 10.1038/srep01416. PMID: 23475303; PMCID: PMC3593222.
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Sci Rep. 2013;3:1416. doi: 10.1038/srep01416.

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

Scientific reports

F Martins, S Faniel, B Rosenow, H Sellier, S Huant, M G Pala, L Desplanque, X Wallart, V Bayot, B Hackens

Affiliations

  1. IMCN/NAPS, Université catholique de Louvain, Louvain-la-Neuve B-1348, Belgium. [email protected]

PMID: 23475303 PMCID: PMC3593222 DOI: 10.1038/srep01416

Abstract

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.

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