Neutral Modes and the Undoing of Anyonic Interferometry

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

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.