CUED Publications database

Ultrafast pseudospin dynamics in graphene

Trushin, M and Grupp, A and Soavi, G and Budweg, A and De Fazio, D and Sassi, U and Lombardo, A and Ferrari, AC and Belzig, W and Leitenstorfer, A and Brida, D (2015) Ultrafast pseudospin dynamics in graphene. Physical Review B - Condensed Matter and Materials Physics, 92. ISSN 1098-0121

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© 2015 American Physical Society. Interband optical transitions in graphene are subject to pseudospin selection rules. Impulsive excitation with linearly polarized light generates an anisotropic photocarrier occupation in momentum space that evolves at time scales shorter than 100 fs. Here, we investigate the evolution of nonequilibrium charges towards an isotropic distribution by means of fluence-dependent ultrafast spectroscopy and develop an analytical model able to quantify the isotropization process. In contrast to conventional semiconductors, the isotropization is governed by optical phonon emission, rather than electron-electron scattering, which nevertheless contri butes in shaping the anisotropic photocarrier occupation within the first few femtoseconds.

Item Type: Article
Divisions: Div B > Solid State Electronics and Nanoscale Science
Div B > Electronics, Power & Energy Conversion
Div B > Photonics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:58
Last Modified: 22 Jun 2018 20:32