The recent experimental realization of a high quality WSe leads to the possibility of magneto-optical measurements and the manipulation of the spin and valley degrees of freedom. We study the influence of the very strong spin-orbit coupling and of the anisotropic lifting of the valley pseudospin degeneracy on its magnetotransport properties. The energy spectrum of WSe2 is derived and discussed in the presence of a perpendicular magnetic field B. Correspondingly we evaluate the magneto-optical Hall conductivity and the optical longitudinal conductivity as functions of the frequency, magnetic field, and Fermi energy. They are strongly influenced by the field B and the strong spin splitting. The former exhibits valley polarization and the latter beatings of oscillations. The magneto-optical responses can be tuned in two different regimes: the mictrowave-to-terahertz regime and the visible-frequency one. The absorption peaks involving the n=0 LL appear in between these two regimes and show a magnetic control of the spin and valley splittings. We also evaluate the power absorption spectrum.
@article{arxiv.1607.06917,
title = {Magneto-optical transport properties of monolayer WSe2},
author = {M. Tahir and P. Vasilopoulos},
journal= {arXiv preprint arXiv:1607.06917},
year = {2016}
}
Comments
15 pages and 11 Figs. arXiv admin note: text overlap with arXiv:1505.06780