1302.5891 (D. M. Basko)

Effect of anisotropic band curvature on carrier multiplication in
graphene    [PDF]

D. M. Basko

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. 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.

View original: http://arxiv.org/abs/1302.5891