AC-field Induced Gap Opening in the Vicinity of Extra Dirac Points in Band Structure of Graphene Superlattice

Floquet spectrum of electrons in graphene superlattice subjected to the ac electric field was investigated. The ac-field vector was assumed to oscillate perpendicularly to the superlattice axis. In the vicinity of extra Dirac points of superlattice band structure the gap was shown to be dynamically induced by the ac-field. Such effects are due to the nonadditivity of the electron spectrum of graphene superlattice

Constant Electric Field Influence on the Rectification of the Transversal Current Induced by the Sinusoidal and Cnoidal Electromagnetic Waves in Graphene Superlattice

In graphene superlattice the direct current induced in perpendicular direction with relation to the superlattice axis by cnoidal and sinusoidal electromagnetic waves under the presence of longitudinal constant electric field was calculated. Direct current dependences on the cnoidal wave amplitude and on the longitudinal electric field intensity were investigated. Direct current dependence on the cnoidal wave amplitude was shown to have resonant character. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3544

AC-field Induced Gap Opening in the Vicinity of Extra Dirac Points in Band Structure of Graphene Superlattice

Floquet spectrum of electrons in graphene superlattice subjected to the ac electric field was investigated. The ac-field vector was assumed to oscillate perpendicularly to the superlattice axis. In the vicinity of extra Dirac points of superlattice band structure the gap was shown to be dynamically induced by the ac-field. Such effects are due to the nonadditivity of the electron spectrum of graphene superlattice

Electromagnetic Radiation Influence on the Transversal Conductivity of the Graphene Superlattice

The transversal conductivity of the graphene superlattice under electromagnetic radiation and constant electric field applied along the superlattice axis was calculated. The cases of sinusoidal and cnoidal electromagnetic waves are considered. Conductivity dependences on the electromagnetic wave amplitude and on the longitudinal electric field intensity were investigated. Such dependences were shown to have the character of oscillations. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3536

Electron States and Quasienergy Spectrum of the Graphene Exposed to the Electromagnetic Wave

The effective spectrum and wave functions of electron states in graphene under the electromagnetic wave with circular polarization are found. The band gap in the graphene spectrum induced by the electromagnetic wave is calculated. Occurrence of such gap is shown to have the nature of the parametric resonance. The effective energy of the electron state in graphene is proved to be the energy averaged over the period of the electromagnetic wave. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3192

Linewidth of Cyclotron Absorption in Band-Gap Graphene: Relaxation Time Approximation vs. Monte Carlo Method

The power of the elliptically polarized electromagnetic radiation absorbed by band-gap graphene in presence of constant magnetic field is calculated. The linewidth of cyclotron absorption is shown to be nonzero even if the scattering is absent. The calculations are performed analytically with the Boltzmann kinetic equation and confirmed numerically with the Monte Carlo method. The dependence of the linewidth of the cyclotron absorption on temperature applicable for a band-gap graphene in the absence of collisions is determined analytically

Effect of high-frequency laser radiation on the graphene current-voltage characteristic

The effective spectrum of electron states of graphene taking into account the action of high-frequency laser radiation with elliptical polarization was calculated. Band gap was shown to arise in the graphene spectrum in conditions of high-frequency electromagnetic wave. The current-voltage characteristic of the graphene exposed to such radiation was studied. Effect of high-frequency electric field on the electron magnetotransport in graphene was discussed

Linewidth of Cyclotron Absorption in Band-Gap Graphene: Relaxation Time Approximation vs. Monte Carlo Method

The power of the elliptically polarized electromagnetic radiation absorbed by band-gap graphene in presence of constant magnetic field is calculated. The linewidth of cyclotron absorption is shown to be nonzero even if the scattering is absent. The calculations are performed analytically with the Boltzmann kinetic equation and confirmed numerically with the Monte Carlo method. The dependence of the linewidth of the cyclotron absorption on temperature applicable for a band-gap graphene in the absence of collisions is determined analytically

Effect of high-frequency laser radiation on the graphene current-voltage characteristic

The effective spectrum of electron states of graphene taking into account the action of high-frequency laser radiation with elliptical polarization was calculated. Band gap was shown to arise in the graphene spectrum in conditions of high-frequency electromagnetic wave. The current-voltage characteristic of the graphene exposed to such radiation was studied. Effect of high-frequency electric field on the electron magnetotransport in graphene was discussed