Abstract
The effect of the strain on the spin and valley dependent transport properties, including the conductance and polarization, through a monolayer MoS2 superlattice under Rashba spin–orbit coupling is theoretically investigated. It is found that the conductance strongly depends on the spin and valley degrees of freedom, and spin-inversion can be achieved by MoS2 superlattice. Also, the spin and valley dependent conductance in a monolayer MoS2 superlattice can be efficiently adjusted via strain and the number of the superlattice barriers. Moreover, it is demonstrated that both the magnitude and sign of the spin and valley polarization depend on the strain strength, the number of barriers, and electrostatic barrier height. Both full spin and valley polarized current (with 100% or − 100% efficiency) can be realized in a MoS2 superlattice under strain.
Highlights
The effect of the strain on the spin and valley dependent transport properties, including the conductance and polarization, through a monolayer MoS2 superlattice under Rashba spin–orbit coupling is theoretically investigated
Electrons could transmit through the monolayer M oS2 superlattice only with spin-flip, In this case the spin state of outgoing electrons were inverted by using monolayer M oS2 superlattice
The other motivation of this paper is the calculation of the valley and spin polarization in a monolayer M oS2 superlattice under strain and Rashba spin–orbit coupling (RSOC)
Summary
We are interested in the spin- and valley-dependent transport properties in a MoS2 superlattice with RSOC in the presence of a uniaxial strain. M oS2 regions (in the the longitudinal kx ( ks′(s) ) and ERSOC regions) with k The spin and valley dependent transmission probability, Ts′sη , (with the spin s =↑, ↓ to be transmitted to the spin s′ =↑, ↓ ) through the monolayer MoS2 superlattice with N electrostatic barriers can obtained by applying the boundary conditions and using the transfer matrix a pproach[54,55]. The spin and valley dependent conductance of a monolayer M oS2 superlattice under strain and RSOC is defined a s56:
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