Zeeman- and electric-field control of spin- and valley-polarized transport through biased magnetic junctions on WSe2

The electronic properties of WSe2 comprise a huge spin-orbit coupling, a wide direct band gap, and especially a strong anisotropic lifting of the degeneracy of the valley degree of freedom in a magnetic field. We study ballistic electron transport through single or double junctions on monolayer WSe2 in the presence of spin Ms and valley Mv Zeeman fields and of an electric potential U. The conductance vs. the field Ms or Mv decreases in a fluctuating manner. For a single junction the spin Ps and valley Pv polarizations rise with , reach a value of more than 70%, and become perfect above while for a double junction this change can occur for and . Pv increases with U and both polarizations oscillate with the junction width. The results may render WSe2 a promising candidate for new spintronic and valleytronic devices.