Spectroscopic Characterization of Gapped Graphene in the Presence of Circularly Polarized Light

Abstract

We present a description of the energy loss of a charged particle moving parallel to a graphene layer and graphene double layers. Specifically, we compare the stopping power of the plasma oscillations for these two configurations in the absence as well as the presence of circularly polarized light whose frequency and intensity can be varied to yield an energy gap of several hundred $\text{meV}$ between the valence and conduction bands. The dressed states of the Dirac electrons by the photons yield collective plasma excitations whose characteristics are qualitatively and quantitatively different from those produced by Dirac fermions in gapless graphene, due in part to the finite effective mass of the dressed electrons. For example, the range of wave numbers for undamped self-sustaining plasmons is increased as the gap is increased, thereby increasing the stopping power of graphene for some range of charged particle velocity when graphene is radiated by circularly polarized light.

References in corpus (11)

• The electronic properties of graphene
• Properties of Graphene: A Theoretical Perspective
• Dynamical polarization of graphene at finite doping
• Driven quantum transport on the nanoscale
• Scanning Tunneling Spectroscopy of Graphene on Graphite
• Tuning laser-induced bandgaps in graphene
• Metal-insulator transition in graphene induced by circularly polarized photons
• Dynamical polarization, screening, and plasmons in gapped graphene
• Optical response of graphene under intense terahertz fields
• Effect of radiation on transport in graphene
• Plasma excitations of dressed Dirac electrons in graphene layers

Cited by in corpus (1)

• Terahertz Science and Technology of Carbon Nanomaterials