Slowing hot carrier relaxation in graphene using a magnetic field

Details Slowing hot carrier relaxation in graphene using a magnetic field Slowing hot carrier relaxation in graphene using a magnetic field

2009-06-05

arxiv.org/abs/0906.1104v2

Phys. Rev. B 80, 245415 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

A degenerate pump--probe technique is used to investigate the non equilibrium carrier dynamics in multi--layer graphene. Two distinctly different dynamics of the carrier relaxation are observed. A fast relaxation ($\sim 50$ fs) of the carriers after the initial effect of phase space filling followed by a slower relaxation ($\sim 4$ ps) due to thermalization. Both relaxation processes are less efficient when a magnetic field is applied at low temperatures which is attributed to the suppression of the electron-electron Auger scattering due to the non equidistant Landau level spacing of the Dirac fermions in graphene.

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