Photoinduced pseudospin effects in silicene beyond the off resonant condition

Abstract

We study the photoinduced manipulation of charge carriers in monolayer silicene subject to intense electromagnetic terahertz radiation. Considering the Dirac cone approximation and going beyond the off resonant condition for large frequencies of the radiation field, where only virtual photon processes are allowed, we present the exact zero-momentum pseudospin polarization and numerical results for the quasienergy band structure and time-averaged density of states. We find that resonant processes, due to real photon emission and absorbtion processes, induce a band inversion that qualitatively modifies the quasienergy spectrum. These band structure changes manifest themselves as an inversion of the averaged pseudospin polarization. Through the analysis of the time-averaged density of states we find that effective photoinduced gap manipulation can only be achieved in the intermediate and strong matter-radiation coupling regime where the off resonant approximation breaks down.

arXiv comment8 pages, 3 figures, Accepted in PRB (in press)

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• Floquet topological phase transition in $\alpha$-${\mathcal{T}}_3$ lattice
• Floquet interface states in illuminated three-dimensional topological insulators
• One-way transport in laser-illuminated bilayer graphene: A Floquet isolator
• Floquet topological phase transitions in a periodically quenched dimer
• Electric field controlled spin- and valley-polarized edge states in silicene with extrinsic Rashba effect
• Macroscopic degeneracy of zero-mode rotating surface states in 3D Dirac and Weyl semimetals under radiation
• Probing Topological signatures in an optically driven $\alpha$-$T_3$ Lattice
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• Anomalous heat flow in 8-$Pmmn$ borophene with tilted Dirac cones
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• Valley caloritronics in a photodriven hetero-junction of Dirac materials
• Genesis of the Floquet Hofstadter butterfly
• Floquet bound states around defects and adatoms in graphene
• Photo-modulation of the spin Hall conductivity of mono-layer transition metal dichalcogenides
• Floquet engineering of topological phase transitions in quantum spin Hall $\alpha$-$T_3$ system
• Driven Hofstadter Butterflies and Related Topological Invariants
• Localization length versus level repulsion in 1-D driven disordered quantum wires
• Manipulating Z2 and Chern topological phases in a single material using periodically driving fields
• Anomalous Rabi oscillation and related dynamical polarizations under the off-resonance circularly polarized light
• Spin texture of an irradiated warped topological insulator surface
• Josephson effect in silicene-based SNS Josephson junction: Andreev reflection and free energy
• Nearly pure spin-valley sideband tunneling in silicene: effect of interplay of time periodic potential barrier and spin-valley-dependent Dirac mass
• Low-temperature thermal transport and thermopower of monolayer transition metal dichalcogenide semiconductors
• Anomalous photo-thermal effects in multi-layered semi-Dirac black phosphorus
• Spin-orbit effects on the spin and pseudospin polarization in ac-driven silicene
• Electric spin and valley Hall effects