Nanoelectronics Group

Post-doc positions

We are looking for excellent and highly motivated post-doc candidateS for the following projects:

 

  • Anyons on demand (2 years contract - ANR FullyQuantum 2018):

The Nanoelectronics Group currently has an opening for a Post-Doctoral Position on our experiment on Anyonic statistics with Fractional Levitons in the Fractional Quantum Hall Effect regime.
The candidate will lead a presently running experiment on the project on abelian and non-abelian statististics using on-demand anyon sources based on levitons in the FQHE regime. Through electronic Hong Ou Mandel interferences, the time control would permit an unprecedented measurement of the quantum statistical angle of e/3 or e/5 anyons or non-abelian anyons.
References:

  • Nature 502, 659–663 (2013) dx.doi.org/10.1038/nature12713

  • Nature 514, 603–607 (2014) DOI: 10.1038/nature13821

  • A Josephson relation for fractionally charged anyons, Science 363, pp. 846-849 (2019) DOI: 10.1126/science.aau3539 (preprint)

contact: christian.glattli@cea.fr


  • Thermal conductance of many-body quantum Hall states of graphene (2 years contract- ERC QuaHQ, 2019):

The goal of this project is to explore quantum transport of heat in new states of matter arising in ultra-clean graphene under high magnetic fields, using ultra-sensitive electronic noise measurements. This project is funded by the European Research Council (ERC-StG-2018 805080 QUAHQ).

We have an open position (starting February 2019) for a highly talented postdoctoral collaborator, with comprehensive skills in nanofabrication (in particular van der Waals heterostructures), low noise measurements, and cryogenics.

contact: François Parmentier


  • Single-charge detection for electron quantum optics (2 years post doc)

The present state of the art is to read out electron quantum optics experiments by a measurement of the average transfer probability of electrons into output ports (i.e. current) and the current noise. This project will break new ground, developing techniques for the detection of the individual single-electron wave packet.

For levitons the project will explore the use of a single-leviton induced electron-avalanche in a graphene constriction in the QHE regime, biases near breakdown, which will be detected by a measurable noise . Presently the QHE breakdown mechanisms in high-mobility h-BN graphene is unknown. The project will advance the state of the art understanding of its mechanisms and signatures, notably its ability to detect ultra-small (≤ 1 pA) DC current or short-time current pulses (yet explored in GaAs).

contact: Preden Roulleau



PhD & Intern positions

We are looking for motivated students for the following projects:

  • Electronic quantum optics in graphene

Flying qubits research led to the recent emergence of the field of electron quantum optics, where electrons play the role of photons in quantum optic like experiments. This has recently enabledthe development of electronic quantum interferometry as well as single electron sources. As of yet, such experiments have only been successfully implemented in semi-conductor heterostructures cooled at extremely low temperatures. Realizing electron quantum optics experiments in graphene, an inexpensive material showing a high degree of quantum coherence even at moderately low temperatures, would be a strong evidence that quantum computing in graphene is within reach.

One of the most elementary building blocks necessary to perform electron quantum optics experiments is the electron beam splitter, which is the electronic analog of a beam splitter for light. However, the usual scheme for electron beam splitters in semi-conductor heterostructures isnot available in graphene because of its gapless band structure. I propose a breakthrough in this direction where pn junction plays the role of electron beam splitter. Based on this, an electronic Mach Zehnder interferometer will be studied to understand the quantum coherence properties of graphene. This PhD proposal is part of the ERC starting COHEGRAPH (2016)

contact: Preden Roulleau

 
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