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

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Rodrigues Martins, Frederico [UCL] Faniel, Sébastien [UCL] Rosenow, B. [Institute for Theoretical Physics, Leipzig University, Germany] Sellier, H. [Institut Néel, CNRS and Université Joseph Fourier, Grenoble, France] Huant, S. [Institut Néel, CNRS and Université Joseph Fourier, Grenoble, France] Bayot, Vincent [UCL] Hackens, Benoît [UCL]

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.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2013
Language Anglais
Journal information "Scientific Reports" - Vol. 3, no. 1416, p. 1416 (2013)
Peer reviewed yes
Publisher Nature Publishing Group ((United Kingdom) London)
issn 2045-2322
Publication status Publié
Affiliation UCL - SST/IMCN/NAPS - Nanoscopic Physics
Links
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Bibliographic reference Rodrigues Martins, Frederico ; Faniel, Sébastien ; Rosenow, B. ; Sellier, H. ; Huant, S. ; et. al. Coherent tunnelling across a quantum point contact in the quantum Hall regime. In: Scientific Reports, Vol. 3, no. 1416, p. 1416 (2013)
Permanent URL http://hdl.handle.net/2078.1/128553