Slowing hot-carrier relaxation in graphene using a magnetic field
Abstract
A degenerate pump-probe technique is used to investigate the nonequilibrium carrier dynamics in multilayer graphene. Two distinctly different dynamics of the carrier relaxation are observed. A fast relaxation (∼50fs) of the carriers after the initial effect of phase-space filling followed by a slower relaxation (∼4ps) 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 nonequidistant Landau-level spacing of the Dirac fermions in graphene.
- Publication:
-
Physical Review B
- Pub Date:
- December 2009
- DOI:
- 10.1103/PhysRevB.80.245415
- arXiv:
- arXiv:0906.1104
- Bibcode:
- 2009PhRvB..80x5415P
- Keywords:
-
- 78.66.Tr;
- 78.20.Ls;
- 78.47.J-;
- 78.67.Pt;
- Fullerenes and related materials;
- Magnetooptical effects;
- Ultrafast pump/probe spectroscopy;
- Multilayers;
- superlattices;
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Condensed Matter - Other Condensed Matter
- E-Print:
- 5 pages, 4 figures