title: Full-band quantum-dynamical theory of saturation and four-wave mixing in graphene.
abstract: The linear and nonlinear optical response of graphene are studied within a quantum-mechanical, full-band, steady-state density-matrix model. This nonpurtabative method predicts the saturatable absorption and saturable four-wave mixing of graphene. The model includes τ(1) and τ(2) time constants that denote carrier relaxation and quantum decoherence, respectively. Fits to existing experimental data yield τ(2) < 1 fs due to carrier-carrier scattering. τ(1) is found to be on the timescale from 250 fs to 550 fs, showing agreement with experimental data obtained by differential transmission measurements.
authors.affiliation: Georgia Tech Lorraine, Georgia Tech-C.N.R.S. UMI 2958, 2 rue Marconi, Metz, France.
authors.forename: Zheshen
authors.initials: Z
authors.lastname: Zhang
authors.forename: Paul L
authors.initials: PL
authors.lastname: Voss