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.
@article{arxiv.1304.4084,
title = {Monolayer MoS2: trigonal warping, "\Gamma-valley", and spin-orbit coupling effects},
author = {Andor Kormányos and Viktor Zólyomi and Neil D. Drummond and Péter Rakyta and Guido Burkard and Vladimir I. Fal'ko},
journal= {arXiv preprint arXiv:1304.4084},
year = {2013}
}
Comments
new references and a new appendix added, presentation improved