Tunable transmission of quantum Hall edge channels with full degeneracy lifting in split-gated graphene devices

Katrin Zimmermann, Anna Jordan, Frédéric Gay, Kenji Watanabe, Takashi Taniguchi, Zheng Han, Vincent Bouchiat, Hermann Sellier and Benjamin Sacépé ()
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Katrin Zimmermann: Univ. Grenoble Alpes, Institut Néel
Anna Jordan: Univ. Grenoble Alpes, Institut Néel
Frédéric Gay: Univ. Grenoble Alpes, Institut Néel
Kenji Watanabe: Advanced Materials Laboratory, National, Institute for Materials Science
Takashi Taniguchi: Advanced Materials Laboratory, National, Institute for Materials Science
Zheng Han: Univ. Grenoble Alpes, Institut Néel
Vincent Bouchiat: Univ. Grenoble Alpes, Institut Néel
Hermann Sellier: Univ. Grenoble Alpes, Institut Néel
Benjamin Sacépé: Univ. Grenoble Alpes, Institut Néel

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Charge carriers in the quantum Hall regime propagate via one-dimensional conducting channels that form along the edges of a two-dimensional electron gas. Controlling their transmission through a gate-tunable constriction, also called quantum point contact, is fundamental for many coherent transport experiments. However, in graphene, tailoring a constriction with electrostatic gates remains challenging due to the formation of p–n junctions below gate electrodes along which electron and hole edge channels co-propagate and mix, short circuiting the constriction. Here we show that this electron–hole mixing is drastically reduced in high-mobility graphene van der Waals heterostructures thanks to the full degeneracy lifting of the Landau levels, enabling quantum point contact operation with full channel pinch-off. We demonstrate gate-tunable selective transmission of integer and fractional quantum Hall edge channels through the quantum point contact. This gate control of edge channels opens the door to quantum Hall interferometry and electron quantum optics experiments in the integer and fractional quantum Hall regimes of graphene.

Date: 2017
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DOI: 10.1038/ncomms14983

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