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Portal > Offres > Offre UPR2940-FLOPOI-027 - Post-doctorat: investigation du transport électronique dans les canaux hélicoïdaux dans le graphène (H/F)

Post-doctorate: investigation of helical edge transport in graphene

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Français - Anglais

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General information

Reference : UPR2940-FLOPOI-027
Workplace : GRENOBLE
Date of publication : Wednesday, June 17, 2020
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 October 2020
Proportion of work : Full time
Remuneration : 2648 € (monthly gross salary)
Desired level of education : 5-year university degree
Experience required : Indifferent

Missions

Graphene is a 2D material that has attracted a considerable interest since its discovery in 2005. Its gapless linear band structure that mimics massless Dirac fermions has led to the discovery of a wealth of new exciting transport properties. Moreover, the possibility to engineer very high mobility graphene devices in which electrons can travel in a ballistic fashion makes graphene the perfect playground to investigate quantum coherent phenomena in the quantum Hall regime, or when coupled with a superconducting condensate.

Activities

Our research focuses on a new topological state of matter, the quantum Hall topological insulator that our group recently discovered in graphene [1]. This unusual quantum Hall state harbors a pair of counter-propagating, one dimensional edge channels, so-called helical edge channels, which can serve as platform to induce an unconventional superconducting state once hybridized with superconducting electrodes. One of our main objective is to study the quantum transport properties of this helical edge channels and demonstrate that they can be individually manipulated. We expect that such manipulation to be of great interest when topological superconductivity is induced by proximity effect in these channels, in suitably designed hybrid devices. Our group has develop state-of-the-art fabrication processes of high mobility graphene devices by encapsulation of graphene monolayers between insulating boron-nitride flakes, as well as of superconducting graphene devices.

The objective of the Postdoc project is to perform state-of-the-art low-temperature quantum transport measurement of high-mobility graphene devices in the helical phase. Investigations of advanced devices equipped with local gates will be carried out as well as a study of the robustness of the helical phase with magnetic field orientation. The postdoc will participate in the sample fabrication, perform measurements and data analysis, and will take part in the PhD and Master students supervision.
[1] Helical quantum Hall phase in graphene on StrTiO3, L. Veyrat et al. Science 367, 781 (2020)

Skills

We look for highly motivated candidates with a strong background in condensed matter physics / quantum physics, expertise in low-temperature transport measurement of mesoscopic devices, graphene sample fabrication, and quantum Hall physics.
This project will be carried out in close collaboration with theoreticians (Julia Meyer and Manuel Houzet from the CEA Grenoble) involved in the project.

Work Context

The Postdoc will be part of the QuNES team, at Institut Néel, which has a strong expertise in quantum nano-electronics. The Institut NEEL is one of the largest French national research institutes for fundamental research in condensed matter physics enriched by interdisciplinary activities at the interfaces with chemistry, engineering and biology. It is located in the heart of a unique scientific, industrial and cultural environment. It is part of one of Europe's biggest high-tech environment in micro- and nanoelectronics, right next to the French Alpes.

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