Spin-valley dependent Klein tunneling and perfect spin- and valley-polarized transport in a magnetic WSe2 superlattice

Magnetoelectric tuning of spin, valley, and layer-resolved anomalous Nernst effect in transition-metal dichalcogenides bilayers

“….) are attracting considerable research [1][2][3][4][5] due to their direct band gap [6] and the inherently strong spin-orbit coupling (SOC) [7]. The former is due to the breaking of inversion symmetry, and the latter arises from the heavy metal's d orbitals locking the spin and valley degrees of freedom [8].…”

High-efficiency spin and valley filter in a monolayer WSe2 superlattice modulated by an anti-handed off-resonance circularly polarized light

“…Recently, ML transition metal dichalcogenides (TMDCs) [15][16][17][18][19] have received extensive attention since they were experimentally synthesized, and have provided a convenient platform for developing future nanoelectronic devices due to their distinct physical characteristics, such as reasonable inplane carrier mobility rate, high thermal stability and good compatibility with standard semiconductor processes [15,17,[20][21][22]. As a representative of TMDCs, monolayer WSe 2 (ML WSe 2 ) possesses a relatively large band gap (=1.7 eV) [23][24][25] and strong spin-orbit coupling (SOC) [26][27][28] of 450 (30) meV in the valence (conduction) band edge. Therefore, these excellent properties render ML WSe 2 as a promising candidate for designing superlattices to research spin-valley transport.…”

“…In the proposed interlaced superlattice, for K valley electrons, each resonant transmission band or conductance band splits into two subbands with (n-2)/2 resonant peaks for the n period number, and peaks appear as ideal line-types in the low energy region; for K ′ valley electrons, resonant bands appear as (n-2)/2 and n-1 complicated splitting alternately. Moreover, the spin and valley transport through a magnetic WSe 2 superlattice has also been well investigated [30] in the presence of offresonance circularly polarized light (OCPL) and gate voltage. It is demonstrated that there are optically and electrically tunable spin-valley dependent transmission gaps and transmission resonances by increasing the number of barriers.…”

Perfect spin-valley polarization and magnetoresistance in MoS2 tunnel junction with circularly polarized light

“…5,21) The circularly polarized light (CPL) can break the valley degeneracy through the optical Stark effect. 22) Recently, some works on quantum transport properties by the off-resonance CPL have been reported in two-dimensional materials, such as graphene, [23][24][25] silicene, 26) MoS 2 , 27,28) WSe 2 [29][30][31] and so on. Tahir et al 27) theoretically analyzed the effective timeindependent Hamiltonian of MoS 2 with CPL based on Floquet theory which gives results in agreement with experiments, and discussed the influence of CPL on quantum spin and valley Hall effects.…”

“…30) A spin-valley dependent Klein tunneling and spin-and valley-polarized transport could be achieved by the CPL in a magnetic WSe 2 superlattice. 31) However, the works on MR controlled by the CPL are few. 28,29) In this paper, we proposed a new tunnel junction, i.e.…”