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Article Dans Une Revue Scientific Reports Année : 2013

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

Résumé

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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Dates et versions

hal-00932989 , version 1 (23-03-2022)

Identifiants

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F. Martins, S. Faniel, B. Rosenow, Hermann Sellier, Serge Huant, et al.. Coherent tunnelling across a quantum point contact in the quantum Hall regime. Scientific Reports, 2013, 3, pp.1416. ⟨10.1038/srep01416⟩. ⟨hal-00932989⟩
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