Next Thursday's seminar

[Cond.Matt. & Stat.Mech.Section]

SEMINAR on    Disorder and strong electron correlations

 

Thursday, 3 April -  11:30 a.m.


 

Luigi Stasi Seminar Room,  Leonardo Building - first floor

 


Boris NAROZHNY   ( Karlsruhe Institute of Technology )

 

"Giant magnetodrag in graphene   at charge neutrality"

 
Abstract

We report experimental data and theoretical analysis of Coulomb drag between two closely positioned graphene monolayers in a weak magnetic field.  Close enough to the neutrality point, the coexistence of electrons and holes in each layer leads to a dramatic increase of the drag resistivity.  Away from charge neutrality, we observe nonzero Hall drag.  The observed phenomena are explained by decoupling of electric and quasiparticle currents which are orthogonal at charge neutrality.  The sign of magnetodrag depends on the energy relaxation rate and geometry of the sample.