Valley Zeeman effect and spin-valley polarized conductance in monolayer MoS${}_2$ in a perpendicular magnetic field

Abstract

We study the effect of a perpendicular magnetic field on the electronic structure and charge transport of a monolayer MoS${}_2$ nanoribbon at zero temperature. We particularly explore the induced valley Zeeman effect through the coupling between the magnetic field, $B$, and the orbital magnetic moment. We show that the effective two-band Hamiltonian provides a mismatch between the valley Zeeman coupling in the conduction and valence bands due to the effective mass asymmetry and it is proportional to $B^2$ similar to the diamagnetic shift of exciton binding energies. However, the dominant term which evolves with $B$ linearly, originates from the multi-orbital and multi-band structures of the system. Besides, we investigate the transport properties of the system by calculating the spin-valley resolved conductance and show that, in a low-hole doped case, the transport channels at the edge are chiral for one of the spin components. This leads to a localization of the non-chiral spin component in the presence of disorder and thus provides a spin-valley polarized transport induced by disorder.

12 pages, 7 figures, new references are added

References in corpus (8)

• Valley Dependent Optoelectronics from Inversion Symmetry Breaking
• Magnetic Control of Valley Pseudospin in Monolayer WSe2
• Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2
• Breaking of valley degeneracy by magnetic field in monolayer MoSe2
• Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
• Robust optical emission polarization in MoS2 monolayers through selective valley excitation
• Intrinsic optical conductivity of modified-Dirac fermion systems
• Magneto-electric photocurrent generated by direct inter-band transitions in InGaAs/InAlAs two-dimensional electron gas

Cited by in corpus (5)

• Multipath optical recombination of intervalley dark excitons and trions in monolayer WSe${}_2$
• Exciton optics, dynamics and transport in atomically thin semiconductors
• Probing valley filtering effect by Andreev reflection in zigzag graphene nanoribbon
• Transient Hot Electron Dynamics in Single-Layer TaS${}_2$
• Prefect spin filtering and spin inverting using a MoS2 quantum dot