Event Date and Time

Location

Gore104

Speaker

Dr. Woowon Kang, University of Chicago

Host

Chui

In two spatial dimensions quantum mechanical particles are not limited to being bosons
or fermions but can become particles known as anyons. There is a strong theoretical support for
the elementary excitations of the fractional quantum Hall effect (FQHE) being anyons. Anyons
are said to come in two major flavors: Abelian and non-Abelian. The enigmatic evendenominator
FQHE state at filling of n = 5/2 is perhaps the most likely candidate for non-
Abelian statistics. However, detection of the postulated non-Abelian anyons in the FQHE is a
long sought after goal that is known to be quite difficult. In this talk I will present our recent
findings on quantum interference experiments in the FQHE regime in which the statistical angle
of anyonic braiding processes can be measured. At n = 5/2 filling we observe unambiguous
anyonic phase jumps of p/4 and p, which respectively are the statistical angles for the e/4
quasiparticles excitations and the Majorana zero mode of the 5/2 FQHE state. Our interferometry
results provide a strong support for a non-Abelian ground state at the 5/2 filling.