title: The Physics of ultrafast saturable absorption in graphene.
abstract: The ultrafast saturable absorption in graphene is experimentally and theoretically investigated in the femtosecond (fs) time regime. This phenomenon is well-modeled with valence band depletion, conduction band filling and ultrafast intraband carrier thermalization. The latter is dominated by intraband carrier-carrier scattering with a scattering time of 8 ( +/- 3) fs, which is far beyond the time resolution of other ultrafast techniques with hundred fs laser pulses. Our results strongly suggest that graphene is an excellent atomic layer saturable absorber.
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University,21 Nanyang Link, 637371, Singapore.
authors.forename: Guichuan
authors.initials: G
authors.lastname: Xing
authors.forename: Hongchen
authors.initials: H
authors.lastname: Guo
authors.forename: Xinhai
authors.initials: X
authors.lastname: Zhang
authors.forename: Tze Chien
authors.initials: TC
authors.lastname: Sum
authors.forename: Cheng Hon Alfred
authors.initials: CH
authors.lastname: Huan