Domaines
Condensed matter
Low dimension physics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type de stage
Expérimental Description
Even-denominator states of the fractional quantum Hall effect (e.g. 𝜈=5/2) are expected to host excitations that have non-abelian anyonic statistics, corresponding to quantum particles that are neither bosons nor fermions, and the ground state of which changes orthogonally upon exchanging two identical particles. Non-abelian anyons are promising candidates for the realization of topological quantum computing; however, demonstrating the existence of non-abelian statistics is an extremely challenging task, requiring advanced experiments such as interferometry, collisions, and thermal transport measurements. So far, only the latter has been achieved, in only a single system: high-mobility semiconductor GaAs heterostructures. In this project, we propose to implement heat transport and collision experiments, in bilayer graphene, which has recently been shown to host a large number of even-denominator states much more robust than in GaAs, that are thought to be non-abelian. Performing those experiments in bilayer graphene will allow demonstrating the universality of the properties of non-abelian anyons.
This internship, which is planned to be followed by a PhD, involves advanced experimental techniques, including the nanofabrication of ultra-clean bilayer graphene samples in van-der-Waals heterostructures and ultra-high sensitivity thermal and noise measurements at very low temperatures and high magnetic field.
Contact
François Parmentier