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Physics Colloquium

Thursday, November 12, 2020
4:00pm to 5:00pm
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Direct observation of anyonic braiding statistics
Michael J. Manfra, Purdue University,

The fractional quantum Hall effect is an example of a topological phase of matter that occurs when a two-dimensional electron system is cooled to low temperature and placed in a strong magnetic field. Anyons are quasiparticles that, unlike fermions and bosons, show fractional statistics when two of them are exchanged. Here, we report the experimental observation of anyonic braiding statistics for the ν = 1/3 fractional quantum Hall state by using an electronic Fabry–Perot interferometer. Strong Aharonov–Bohm interference of the edge mode is punctuated by discrete phase slips that indicate an anyonic phase θanyon = 2π/3. Our results are consistent with a recent theory that describes an interferometer operated in a regime in which device charging energy is small compared to the energy of formation of charged quasiparticles, which indicates that we have observed anyonic braiding.

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Webinar ID: 826 2427 7023