Effect of the strain on spin-valley transport properties in MoS2 superlattice

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.

Rashba effect: a chemical physicist's approach

“…13,43,44 Current research continues to explore the development of surface modifications. [45][46][47][48][49][50] However, it also delves into GSS induced in novel 2D layered materials, including transition-metal dichalcogenides (TMDs), [51][52][53][54][55][56][57] MXenes, [58][59][60][61][62][63] and a variety of other sheets. [64][65][66][67][68][69][70][71][72] To facilitate the ongoing efforts, it is crucial to develop more robust strategies for enhancing spin splitting.…”

“…Notably, these features of GSS concur with computational predictions and experimental findings for TMDs. [51][52][53][54][55][56][57] Furthermore, owing to the distinct parities of these orbitals relative to the yz plane, the hopping energy from d xy to d x 2 Ày 2 along the x direction carries an opposing sign to that in the Àx direction. Thus, as a natural consequence, the observed splitting along the G-K 0 path exhibits reverse spin polarization-a characteristic feature inherent to hexagonal structures.…”

“…13,43,44 Current research continues to explore the development of surface modifications. 45–50 However, it also delves into GSS induced in novel 2D layered materials, including transition-metal dichalcogenides (TMDs), 51–57 MXenes, 58–63 and a variety of other sheets. 64–72…”

Non‐Hermitian Hartman Effect

“…[23][24][25][26][27][28][29][30][31][32][33][34][35][36] The relevance of tunneling times has been discussed in several areas of physics, including electron tunneling ionization in atoms, [19,[31][32][33][34] photon tunneling in microwave and optical barriers, [23][24][25][26][27][28][29][30] tunneling of ultracold atoms, [35][36][37] and electron tunneling in quantum superlattices and graphene. [38][39][40][41][42] It is now well understood that the group delay time can result in apparent superluminal propagation or even negative group velocities, without violating causality and relativity. [13,17,35,43] For recent works discussing the various controversies and interpretations of the Hartman effect see, for example, the review article [15] and the more recent works.…”

Non-Hermitian Hartman effect

“…Measurements of tunneling times, including the demonstration of the Hartman effect and superluminal group delay times, have been reported in several experiments for electrons, photons and ultracold atoms [23][24][25][26][27][28][29][30][31][32][33][34][35][36]. The relevance of tunneling times has been discussed in several areas of physics, including electron tunneling ionization in atoms [19,[31][32][33][34], photon tunneling in microwave and optical barriers [23][24][25][26][27][28][29][30], tunneling of ultracold atoms [35][36][37] and electron tunneling in quantum superlattices and graphene [38][39][40][41][42]. It is now well understood that the group delay time can result in apparent superluminal propagation or even negative group velocities, without violating causality and relativity [13,17,35,43].…”