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PhD: Specific heat in 2D electron gas (M/F)

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Français - Anglais

Date Limite Candidature : vendredi 25 juin 2021

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General information

Reference : UPR2940-ELOBER-043
Workplace : GRENOBLE
Date of publication : Friday, June 4, 2021
Scientific Responsible name : BOURGEOIS Olivier
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

• Summary
Properties of systems with reduced dimensions (or “nano-systems”) are of colossal interest both from a fundamental point of view (the search for new quantum phases) and from application perspectives (information storage and transfer). The central part of this work will be to develop a new approach to measure specific heat – the ability to store energy- in a 2-Dimensional system. The setup will have to be functional not only at ultralow temperatures (which are necessary to observe fragile quantum phases) but also in the presence of a high magnetic field, which can trigger many body electronic states.

• Detailed subject
Great advances in our understanding of mesoscopic and correlated physics has resulted from studies of electronic transport in 2D electron systems. Thermodynamic properties, such as the “specific heat” of “heat capacity”, which can bring important information on quantum phase transitions or entropy, have nevertheless only be weakly explored in such systems. Indeed, due to the relatively small number of particles in nano-systems, accessing their thermodynamic properties remains an experimental challenge. The goal of this master internship is precisely to address this challenge.

The successful candidate will develop a new specific heat measurement setup with high sensitivity operating inside a dilution fridge refrigerator providing temperatures as low as 10 mK. The second goal of the internship is to adapt this setup to a high magnetic field environment, to make it compatible for the study of thin films or new 2D materials where the magnetic field induces new phase transition related to specific quantum regimes.

• Background and skills expected
Candidates should have a good background in solid state physics and a strong motivation for experimental condensed matter Physics in extreme conditions (low temperatures, high magnetic fields), and in particular, for developing new setups.

Work Context

The successful candidate will be jointly supervised by Olivier Bourgeois and Laurent Saminadayar (Néel Institut, CNRS) and Benjamin Piot (LNCMI-Grenoble, CNRS).

The laboratories are located in Grenoble, in a very rich international scientific environment, in the heart of the Alps.

The Institut NEEL (http://neel.cnrs.fr) is a CNRS laboratory for fundamental research in condensed matter physics, in association with the University of Grenoble-Alpes. About 450 people work there.

The Laboratoire National des Champs Magnétiques Intenses (LNCMI) is a research infrastructure welcoming researchers from around the world for high magnetic field experiments (http://lncmi.cnrs.fr)

Constraints and risks

Handling cryogenic liquids requires strict rules to be followed.

Additional Information

This thesis is proposed within the frame of the ANR project “THERMES-2D”.

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