Anisotropic longitudinal optical conductivities of tilted Dirac bands in 1T${}^{\prime }$-MoS${}_2$

Abstract

1T${}^{\prime }$-MoS${}_2$ exhibits valley-spin-polarized tilted Dirac bands in the presence of external vertical electric field and undergoes a topological phase transition between the topological insulator and band insulator around the critical value of the electric field. Within the linear response theory, we theoretically investigate the anisotropic longitudinal optical conductivities of tilted Dirac bands in both undoped and doped 1T${}^{\prime }$-MoS${}_2$, including the effects of the vertical electric field. The influence of the spin-orbit coupling gap, band tilting, and vertical electric field on the optical conductivities of tilted Dirac bands is revealed. A theoretical scheme for probing the topological phase transition in 1T${}^{\prime }$-MoS${}_2$ via exotic behaviors of longitudinal optical conductivities is proposed. The results for 1T${}^{\prime }$-MoS${}_2$ are expected to be qualitatively valid for other monolayer tilted gapped Dirac materials, such as $\alpha$-SnS${}_2$, TaCoTe${}_2$, and TaIrTe${}_4$, due to the similarity in their band structures.

arXiv comment13 pages, 5 figures, 3 appendices

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• First-principles calculations of electrical conductivities of edge-modified graphene nanoribbons: strain effect
• Transverse Josephson diode effect in tilted Dirac systems
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• Optical conductivity as a probe of the interaction-driven metal in rhombohedral trilayer graphene
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• Influence of Dynamical Floquet Spectrum on the Plasmon Excitations and Exchange Energy of tilted monolayer 1T${}^{\prime }$MoS${}_2$
• Developing a semiclassical Wentzel-Kramers-Brillouin theory for $\alpha -{\mathcal{T}}_3$ model
• Designer gapped and tilted Dirac cones in lateral graphene superlattices