Spin-split bands of metallic hydrogenated ZnO (101¯) surface: First-principles study

Abstract

For spintronics applications, generation of significant spin transport is required, which is achieved by applying a semiconductor surface exhibiting metallic spin-split surface-state bands. We show that metallic spin-split surface-state bands are achieved on hydrogenated ZnO (101¯0) surface by using first-principles density-functional theory calculations. We find that these metallic surface-state bands with dominant Zn-s and p orbitals exhibit Rashba spin splitting with a strong anisotropic character. This finding makes spintronics devices using oxide electronics surface materials possible.

Creating anisotropic spin-split surface states in momentum space by molecular adsorption

“…In Refs. [31][32][33][34] similar variations of the Rashba parameter in the momentum space ranging up to a factor of 11 have been reported. However, in our case the absolute value of the Rahba parameters and therefore the general strength of the Rashba effect is at least about an order of magnitude higher.…”

“…This behavior was outlined to be a consequence of the admixture of bulk states of different symmetry to the surface state [31]. Recently, an anisotropic Rashba effect was also considered for deep d-type surface states [32], in monolayer black phosphorus [33], for a hydrogenated ZnO (1010) surface [34] and in model systems based on an anisotropic two-dimensional electron gas [35].…”

Tunable spin splitting and spin lifetime in polar WSTe monolayer

“…The spin textures in k-space were calculated using the k-space spin density matrix of the spinor wave function. 11,13,14,[24][25][26][27] The polar WSTe ML is modeled as a periodic slab with a sufficiently large vacuum layer (25 Å) in order to avoid interaction between adjacent layers. The geometries were fully relaxed until the force acting on each atom was less than 1 meV=Å.…”