Monolayer MoS2: Trigonal warping, the Gamma valley, and spin-orbit coupling effects

Kormányos, Andor and Zólyomi, Viktor and Drummond, N. D. and Rakyta, Péter and Burkard, G. and Fal'ko, V. I. (2013) Monolayer MoS2: Trigonal warping, the Gamma valley, and spin-orbit coupling effects. PHYSICAL REVIEW B, 88 (4). ISSN 2469-9950

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Abstract

We use a combined ab-initio calculations and k · p theory based approach to derive a low-energy effective Hamiltonian for monolayer MoS2 at the K point of the Brillouin zone. It captures the features which are present in first-principles calculations but not explained by the theory of Xiao et al. [Phys Rev Lett 108, 196802 (2012)], namely the trigonal warping of the valence and conduction bands, the electron-hole symmetry breaking, and the spin-splitting of the conduction band. We also consider other points in the Brillouin zone which might be important for transport properties. Our findings lead to a more quantitative understanding of the properties of this material in the ballistic limit.

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