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

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

doi:10.1063/1.4878535

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

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

Department of Electrical Engineering

SUNY Buffalo
King Mongkut's Institute of Technology Ladkrabang
Arizona State University
Chiba University

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

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.

Original language	English
Article number	193115
Journal	Applied Physics Letters
Volume	104
Issue number	19
DOIs	https://doi.org/10.1063/1.4878535
State	Published - May 12 2014

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AU - Bird, J. P.

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

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