Reversing hot-carrier energy-relaxation in graphene with a magnetic field

Ramamoorthy, H.; Somphonsane, R.; He, G.; Ferry, D. K.; Ochiai, Y.; Aoki, N.; Bird, J. P.

doi:10.1063/1.4878535

Reversing hot-carrier energy-relaxation in graphene with a magnetic field

Author(s)

Ramamoorthy, H.

Somphonsane, R.

He, G.

Ferry, D. K.

Ochiai, Y.

Aoki, N.

Bird, J. P.

Date Issued

May 12, 2014

Type

Article

DOI

10.1063/1.4878535

Abstract

We investigate the influence of a perpendicular magnetic field on hot-carrier energy relaxation in bilayer graphene. Working in the regime of incipient Landau quantization, we find that the magnetic field influences the relaxation in a very different manner, dependent upon the position of the Fermi level relative to the Dirac point. While for carrier densities >10 ¹² cm^-2 relaxation is slowed by the magnetic field, as the density of free carriers approaches zero it instead becomes quicker. We discuss this behavior in terms of the emergence of the zero-energy Landau level, and the role of charge puddling in graphene. © 2014 AIP Publishing LLC.

Citation

Applied Physics Letters, 104(19), 2014