Spin torque induced spin current in a two-dimensional tight-binding system with Rashba coupling in the presence of random impurities

2020 ◽  
Vol 500 ◽  
pp. 166329
Author(s):  
Hemant Kumar Sharma ◽  
Shreekantha Sil ◽  
Ashok Chatterjee
Keyword(s):  
Tight Binding ◽  
Spin Current ◽  
Spin Torque ◽  
Two Dimensional ◽  
Binding System ◽  
Rashba Coupling

scholarly journals Effective Hamiltonian for silicene under arbitrary strain from multi-orbital basis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhuo Bin Siu ◽  
Mansoor B. A. Jalil
Keyword(s):  
Tight Binding ◽  
Spin Torque ◽  
Spin Accumulation ◽  
Effective Hamiltonian ◽  
Fermi Surfaces ◽  
Orbital Basis ◽  
Lattice Symmetry ◽  
Out Of Plane ◽  
Coupling Parameters ◽  
Spin Orbit Interactions

AbstractA tight-binding (TB) Hamiltonian is derived for strained silicene from a multi-orbital basis. The derivation is based on the Slater–Koster coupling parameters between different orbitals across the silicene lattice and takes into account arbitrary distortion of the lattice under strain, as well as the first and second-order spin–orbit interactions (SOI). The breaking of the lattice symmetry reveals additional SOI terms which were previously neglected. As an exemplary application, we apply the linearized low-energy TB Hamiltonian to model the current-induced spin accumulation in strained silicene coupled to an in-plane magnetization. The interplay between symmetry-breaking and the additional SOI terms induces an out-of-plane spin accumulation. This spin accumulation remains unbalanced after summing over the Fermi surfaces of the occupied bands and the two valleys, and can thus be utilized for spin torque switching.

scholarly journals Localized Wannier function based tight-binding models for two-dimensional allotropes of bismuth

2021 ◽  
Author(s):  
Qile Li ◽  
Jackson S Smith ◽  
Yuefeng Yin ◽  
Chutian Wang ◽  
Mykhailo V Klymenko ◽  
...  
Keyword(s):  
Tight Binding ◽  
Wannier Function ◽  
Two Dimensional ◽  
Binding Models
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