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Kirill Shtengel (University of California)
Date & Time
Wed, 06 March 2024, 11:00 to 12:30
Emmy Noether Seminar Room & Online

Non-Abelian anyons are unusual quasiparticles whose many-body wave function doesn't just acquire a phase upon their exchange but changes in a more profound way. These anyons are widely sought for the exotic fundamental physics they harbour as well as for their possible applications for quantum information processing. Despite strong theoretical expectations of their existence in certain quantum Hall states, most prominently at the filling factor ν=5/2, unambiguously establishing their defining property, the non-Abelian braiding statistics, has been slow going.

In this talk I will focus on the recent experiments measuring resistance oscillations as a function of magnetic field in Fabry-Pérot interferometers using new high purity heterostructures at filling fractions  ν=5/2 and 7/2. I will discuss possible theoretical interpretations of the observed oscillations and will argue that these experimental findings  strongly support the non-Abelian nature of quasiparticles in both states. These experiments  also provide an insight into the fermion parity, a topological quantum number associated with an even number of non-Abelian quasiparticles.  The remarkable observed stability of this quantum number strengthens the case for potential utility of these systems for topological quantum computation.

[Ref: Willett et al. Phys. Rev. X 13, 011028 (2023)] 

Zoom link:
Meeting ID: 923 8515 1765
Passcode: 060607