CUED Publications database

Gate-tunable ultrafast optical response of single-layer graphene

Pogna, EAA and Balci, O and Pedrinazzi, P and Guizzardi, M and Tomadin, A and Soavi, G and Polini, M and Ferrari, AC and Cerullo, G (2019) Gate-tunable ultrafast optical response of single-layer graphene. In: Conference on Lasers and Electro-Optics Europe, -- to --.

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Abstract

© 2019 IEEE. The ultrafast relaxation dynamics in single-layer graphene (SLG) is of key importance for its applications in optoelectronic devices which rely on the dynamic response of charge carriers, such as photodetectors, saturable absorbers and modulators[1]. The absorption via interband transitions of a photon of energy in ω SLG promotes an electron from an energy -ω/2 in the valence band to an energy ω/2 in the conduction band. This strongly non-equilibrium distribution thermalizes by electron-electron scattering (t∼ 10-20 fs) to a hot Fermi-Dirac (FD) distribution, which in turn equilibrates with the cold lattice via interaction with strongly-coupled optical phonons (SCOP, t∼200-300 fs) and, on a longer time scale, via anharmonic coupling with acoustic phonons (t∼ 1-2 ps) [2].

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Cron Job
Date Deposited: 20 Nov 2019 20:27
Last Modified: 24 Nov 2020 11:30
DOI: 10.1109/CLEOE-EQEC.2019.8873251