Neutral Modes and the Undoing of Anyonic Interferometry

TYPETheor./Math. Physics Seminar
Speaker:Yuval Gefen
Affiliation:Weizmann
Organizer:Shmuel Fishman
Date:14.06.2015
Time:14:30 - 15:30
Location:Lewiner Seminar Room (412)
Abstract:

Reconstruction of edges of fractional quantum Hall systems (due to interactions and disorder)  may lead to the emergence of neutral modes. The latter are ubiquitous in FQHE.  A seemingly unrelated fact is the failure to observe Aharonov-Bohm oscillations in interferometers (Mach-Zehnder and Fabry-Perot) operating in the FQHE regime. Are these two facts related? I will describe how neutral modes and fractionalization of electrons into eigen edge-components conspire to undermine coherency. I will discuss how one may overcome this adverse effect.