  The quantum magnetotransport properties of a monolayer of molybdenum
disulfide are derived using linear response theory. Especially, the effect of
topological terms on longitudinal and Hall conductivity is analyzed. The Hall
conductivity exhibits fractional steps in the integer quantum Hall regime.
Further complete spin and valley polarization of the longitudinal conductivity
is seen in presence of these topological terms. Finally, the Shubnikov-de Hass
oscillations are suppressed or enhanced contingent on the sign of these
topological terms.
