Full-band quantum-dynamical theory of saturation and four-wave mixing in graphene

Zheshen Zhang, Paul L. Voss

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


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 τ1 and τ2 time constants that denote carrier relaxation and quantum decoherence, respectively. Fits to existing experimental data yield τ2 < 1fs due to carrier-carrier scattering. τ1 is found to be on the timescale from 250fs to 550 fs, showing agreement with experimental data obtained by differential transmission measurements.

Original languageEnglish (US)
Pages (from-to)4569-4571
Number of pages3
JournalOptics letters
Issue number23
StatePublished - Dec 1 2011
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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