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QUantum Hall Edge State Tunnelling spectroscopy

Total Cost €


EC-Contrib. €






 QUEST project word cloud

Explore the words cloud of the QUEST project. It provides you a very rough idea of what is the project "QUEST" about.

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Project "QUEST" data sheet

The following table provides information about the project.


Organization address
address: RUE MICHEL ANGE 3
city: PARIS
postcode: 75794

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country France [FR]
 Project website
 Total cost 1˙761˙411 €
 EC max contribution 1˙761˙411 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2014-STG
 Funding Scheme ERC-STG
 Starting year 2015
 Duration (year-month-day) from 2015-10-01   to  2020-09-30


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 


 Project objective

The quantum nature of an electronic fluid is ubiquitous in many solid-state systems subjected to correlations or confinement. This is particularly true for two-dimensional electron gases (2DEGs) in which fascinating quantum states of matter, such as the integer and fractional quantum Hall (QH) states, arise under strong magnetic fields. The understanding of QH systems relies on the existence of one-dimensional (1D) conducting channels that propagate unidirectionally along the edges of the system, following the confining potential. Due to the buried nature of 2DEG commonly built in semiconducting heterostructures, the considerable real space structure of this 1D electronic fluid and its energy spectrum remain largely unexplored. This project consists in exploring at the local scale the intimate link between the spatial structure of QH edge states, coherent transport and the coupling with superconductivity at interfaces. We will use graphene as a surface-accessible 2DEG to perform a pioneering local investigation of normal and superconducting transport through QH edge states. A new and unique hybrid Atomic Force Microscope and Scanning Tunneling Microscope (STM) operating in the extreme conditions required for this physics, i.e. below 0.1 kelvin and up to 14 teslas, will be developed and will allow unprecedented access to the edge of a graphene flake where QH edge states propagate. Overall, the original combination of magnetotransport measurements with scanning tunnelling spectroscopy will solve fundamental questions on the considerable real-space structure of integer and fractional QH edge states impinged by either normal or superconducting electrodes. Our world-unique approach, which will provide the first STM imaging and spectroscopy of QH edge channels, promises to open a new field of investigation of the local scale physics of the QH effect.


year authors and title journal last update
List of publications.
2019 I. Tamir, A. Benyamini, E. J. Telford, F. Gorniaczyk, A. Doron, T. Levinson, D. Wang, F. Gay, B. Sacépé, J. Hone, K. Watanabe, T. Taniguchi, C. R. Dean, A. N. Pasupathy, D. Shahar
Sensitivity of the superconducting state in thin films
published pages: eaau3826, ISSN: 2375-2548, DOI: 10.1126/sciadv.aau3826
Science Advances 5/3 2020-04-04
2019 Kévin Le Calvez, Louis Veyrat, Frédéric Gay, Philippe Plaindoux, Clemens B. Winkelmann, Hervé Courtois, Benjamin Sacépé
Joule overheating poisons the fractional ac Josephson effect in topological Josephson junctions
published pages: , ISSN: 2399-3650, DOI: 10.1038/s42005-018-0100-x
Communications Physics 2/1 2019-08-05
2019 Thomas Dubouchet, Benjamin Sacépé, Johanna Seidemann, Dan Shahar, Marc Sanquer, Claude Chapelier
Collective energy gap of preformed Cooper pairs in disordered superconductors
published pages: 233-236, ISSN: 1745-2473, DOI: 10.1038/s41567-018-0365-8
Nature Physics 15/3 2019-08-05
2019 Louis Veyrat, Anna Jordan, Katrin Zimmermann, Frédéric Gay, Kenji Watanabe, Takashi Taniguchi, Hermann Sellier, Benjamin Sacépé
Low-Magnetic-Field Regime of a Gate-Defined Constriction in High-Mobility Graphene
published pages: 635-642, ISSN: 1530-6984, DOI: 10.1021/acs.nanolett.8b02584
Nano Letters 19/2 2019-08-05
2019 Benjamin Sacépé, Johanna Seidemann, Frédéric Gay, Kevin Davenport, Andrey Rogachev, Maoz Ovadia, Karen Michaeli, Mikhail V. Feigel’man
Low-temperature anomaly in disordered superconductors near Bc2 as a vortex-glass property
published pages: 48-53, ISSN: 1745-2473, DOI: 10.1038/s41567-018-0294-6
Nature Physics 15/1 2019-08-05
2018 Hyunjeong Kim, Frédéric Gay, Adrian Del Maestro, Benjamin Sacépé, Andrey Rogachev
Pair-breaking quantum phase transition in superconducting nanowires
published pages: , ISSN: 1745-2473, DOI: 10.1038/s41567-018-0179-8
Nature Physics 2019-05-29
2017 Katrin Zimmermann, Anna Jordan, Frédéric Gay, Kenji Watanabe, Takashi Taniguchi, Zheng Han, Vincent Bouchiat, Hermann Sellier, Benjamin Sacépé
Tunable transmission of quantum Hall edge channels with full degeneracy lifting in split-gated graphene devices
published pages: 14983, ISSN: 2041-1723, DOI: 10.1038/ncomms14983
Nature Communications 8 2019-05-29

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