title: Efficient nonlinear generation of THz plasmons in graphene and topological insulators.
abstract: Surface plasmons in graphene may provide an attractive alternative to noble-metal plasmons due to their tighter confinement, peculiar dispersion, and longer propagation distance. We present theoretical studies of the nonlinear difference frequency generation (DFG) of terahertz surface plasmon modes supported by two-dimensional layers of massless Dirac electrons, which includes graphene and surface states in topological insulators. Our results demonstrate strong enhancement of the DFG efficiency near the plasmon resonance and the feasibility of phase-matched nonlinear generation of plasmons over a broad range of frequencies.
authors.affiliation: Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA.
authors.forename: Xianghan
authors.initials: X
authors.lastname: Yao
authors.affiliation: Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950, Russia.
authors.forename: Mikhail
authors.initials: M
authors.lastname: Tokman
authors.affiliation: Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA.
authors.forename: Alexey
authors.initials: A
authors.lastname: Belyanin