Influence of Dynamical Floquet Spectrum on the Plasmon Excitations and Exchange Energy of tilted monolayer 1T${}^{\prime }$MoS${}_2$

Abstract

It is now well established that a high-frequency electromagnetic dressing field within the off-resonance regime significantly modifies the electronic transport and optical properties on Dirac materials. Here, using light with circular polarization, we investigate its effect on the energy spectrum of tilted monolayer 1T${}^{\prime }$MoS${}_2$ which acquires two energy gaps associated with up- and down- pseudospin. We can adjust its electronic properties over a wider range by varying these two band gaps in contrast with graphene. With the use of the Lindhard approach for the frequency-dependent polarizability propagator, we have developed a rigorous theoretical formalism for employing the Floquet energy spectrum for investigating the many-body effects on the plasmon excitations, their lifetimes due to Landau damping and the exchange energy of tilted monolayer 1T${}^{\prime }$MoS${}_2$ under normal incidence of electromagnetic radiation at arbitrary temperature. The dressed states at very low temperature corresponding to circular polarization suppress the response of the system to the external probe. This gives rise to the weak but long lived plasmon excitations at small wavenumber $q$ when compared to the plasmon spectrum in this regime in the absence of irradiation. However, $\sqrt{qT}$-dependent plasmons are restored at high temperatures. Our calculations have shown that the tilting, anisotropy, direct and indirect band gaps lead to a reduced exchange energy, which has some potential applications such as, tunability of exciton polariton and plasmon excitations.

References in corpus (24)

• The electronic properties of graphene
• Dielectric function, screening, and plasmons in 2D graphene
• Dynamical polarization of graphene at finite doping
• Magnetic field tuning of terahertz Dirac plasmons in graphene
• Dynamical polarization, screening, and plasmons in gapped graphene
• Chirality and Correlations in Graphene
• Tailoring quantum gases by Floquet engineering
• Collective modes of doped graphene and a standard 2DEG in a strong magnetic field: linear magneto-plasmons versus magneto-excitons
• Magnetoplasmons in layered graphene structures
• Electron states for gapped pseudospin-1 fermions in the field of charged impurity
• Optical properties of a semi-Dirac material
• Anisotropic longitudinal optical conductivities of tilted Dirac bands in 1T${}^{\prime }$-MoS${}_2$
• Ground-state properties of gapped graphene using the random phase approximation
• Finite-temperature plasmons, damping and collective behavior for $\alpha -{\mathcal{T}}_3$ model
• Interaction-driven transport of dark excitons in 2D semiconductors with phonon-mediated optical readout
• Finite temperature dynamical polarization and plasmons in gapped graphene
• Tilted Dirac cone effects and chiral symmetry breaking in a planar four-fermion model
• Self-consistent quantum-kinetic theory for interplay between pulsed-laser excitation and nonlinear carrier transport in a quantum-wire array
• Visualization of dark excitons in semiconductor monolayers for high-sensitivity strain sensing
• Highly anisotropic optical conductivities in two-dimensional tilted semi-Dirac bands
• Effect of magnetic field on the electronic properties of an $\alpha$-$T_3$ ring
• Superconducting phase transition in planar fermionic models with Dirac cone tilting
• Polarizability, plasmons, and screening in 1T${}^{\prime }$-MoS${}_2$ with tilted Dirac bands
• An experimental scheme for determining the Berry phase in two-dimensional quantum materials with a flat band