Seminar on Thursday - note time change

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

Please note time change below
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SEMINAR on     Disorder and strong electron correlations


Thursday, 28 March -  10:00 a.m.



Luigi Stasi Seminar Room,  Leonardo Building - first floor

 
 
Denis BASKO    (LPMMC, Grenoble)


"On the carrier multiplication in graphene"


Abstract

 
We study relaxation of an excited electron in the conduction band of intrinsic graphene at zero temperature due to production of interband electron-hole pairs by Coulomb interaction.  The electronic band curvature, being anisotropic because of trigonal warping, is shown to suppress relaxation for a range of directions of the initial electron momentum. For other directions, relaxation is allowed only if the curvature exceeds a finite critical value; otherwise, a non-decaying quasiparticle state is shown to exist.