Magnetotransport in monolayer 2H-MoTe2*

Monolayer transtion metal dichalcogenides (TMD) have been investigated for a variety of interesting aspects: valley Hall effect, biexcitons, and 2-D superconductivity. In magnetotransport, monolayer TMDs break inversion symmetry and as a result has degenerate K/K' bands which are spin-split. In MoS2, this spin-splitting between the lower and upper K/K' bands in the conduction band is around 15 meV, 5x larger than expected, and similar results have been extracted from monolayer WSe2. In both cases, neither system can be investigated via electrical transport in both the n- and p-type carrier regime due to the large bandgap and issues with contacts. Monolayer, 2H-MoTe2 however, has a much smaller bandgap of 1.1 eV. Though there has been much work done on electrical characterization in MS2 and MSe2 (M = Mo or W), there has been almost no work done on 2H-MoTe2 as the monolayer is air sensitive and more difficult to contact than like 2-D air sensitive materials such as InSe or black phosphorus. In this study we report the magnetotranpsort of monolayer 2H-MoTe2 in the ultra-clean limit.