Physics (Internal)

Fluctuation-dissipation theorem for chiral systems in non-equilibrium steady states

This event is part of the Condensed Matter Theory Seminar Series.

Abstract: We consider a three-terminal system with a chiral edge channel
connecting the source and drain terminals. Charge can tunnel between
the chiral edge and a third terminal. The third terminal is maintained
at a different temperature and voltage than the source and drain. We prove a general relation for the current noises detected in the drain
and third terminal. It has the same structure as an equilibrium
fluctuation-dissipation relation with the nonlinear response in place
of the linear conductance. The result applies to a general chiral
system and can be useful for detecting "upstream" modes on quantum
Hall edges.