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Envoyé par Alexandre Assouline

Thèse Grenoble: Quantum capacitance as a probe of non-abelian anyonsvendredi 3 novembre 2023 10:35:01 |
Membre depuis : 1 an Posts: 2 |

Non-abelian anyons are a type of quasiparticle that can be generated in low dimensional (d<3), strongly

interacting electronic system. The interest in such anyons lies in their new quantum statistic, neither

bosonic nor fermionic, which make it possible to manipulate the ground state of an electronic system by

exchanging the position of its particles. This controlled exchange of the anyon positions, known as

braiding, should lead to topological qubits with exceptionally low error rates [1]. In addition, the

possibility of exploring a new quantum statistic beyond the fermion-boson dichotomy is of considerable

fundamental interest.

[1] “Non-Abelian anyons and topological quantum computation”

C. Nayak et al. Review of Modern Physics (2008).

The most promising route to realizing non-abelian anyons is the fractional quantum Hall effect, where

a 2D electron system is subjected to a strong perpendicular magnetic field. Bilayer graphene has recently

been shown to be a promising platform for probing these anyons, thanks to its high electron mobility

and high degree of tunability. Their detection relies on their non-trivial quantum statistics, which can be

inferred from low temperature measurement of the chemical potential. The goal of this project is to

probe the chemical potential in a capacitor geometry in which one of the plates is made of bilayer

graphene. The candidate will be involved in the sample fabrication process, where single electron

transistors, used as highly sensitive detectors of the chemical potential, are placed on bilayer graphene

equipped with electrostatic gates. She/He will be involved in low noise

cryogenic measurements of quantum capacitors.

University of California Santa Barbara – Young lab.

Background in condensed matter physics.

Interest in experimental condensed matter physics with quantum electrical circuits.

Flexible.

Alexandre Assouline : alexandre.assouline@neel.cnrs.fr