“Toward the Detection of Emergent Anyons in the Fractional Quantum Hall Effect ” by Woowon Kang (University of Chicago),

Date: 
Wednesday, November 12, 2014 - 4:00pm
Series: 
Condensed Matter Journal Club Seminars

 

Abstract:

In two spatial dimensions quantum mechanical particles are not limited to being bosons or fermions as they are in three dimensions, but can become particles known as anyons. Anyons are said to come in two major types: Abelian and non-Abelian. Soon after the discovery of the fractional quantum Hall effect (FQHE), the quasiparticles of FQHE were predicted to be anyons. In this talk I will discuss our experimental study of phase slips in quantum interference experiments of FQHE states through which the statistical angle of anyonic braiding processes can be measured. In the nu =7/3 FQHE state we detect the postulated Abelian statistical phase angle of 2pi/3. In the interference study of the nu = 5/2 FQHE state, which is said to be a p-wave BCS paired quantum Hall state of composite fermions, we observe phase slips of pi/4, pi, and 5pi/4. The pi-phase slip are consistent with the braiding involving Majorana zero modes of the nu = 5/2 FQHE quasiparticles, providing support for the existence of the postulated non-Abelian ground state at nu = 5/2 filling.

Location: 
IN PAB ROOM 4-330