Abstract
The electronic properties of antimonene, single-layer Sb, are attracting great attention. In this paper, spin transport in armchair antimonene nanoribbon (ASbNR) is investigated. Following the tight-binding model, we calculate both the transmission probability and the conductance by means of the non-equilibrium Green's function (NEGF) method. The effects of an external electric field vertical to the ribbon plane are explored. Our results indicate that the spin-flip rate increases with the vertical electric field. Disorder effects on spin transport are addressed by considering the presence of charged impurities. It is found that charged impurities also enhance the spin-flip rate but to a lesser extent than the out-of-plane electric field.
Highlights
Thin two-dimensional materials have attracted great attention due to their excellent properties and promising applications in next-generation nanoelectronics devices
The wide bandgap alongside the high mobility of the carriers favors this material for applications in metal-oxidesemiconductor field-effect transistors (MOSFETs)[22]
Theoretical works on monolayer Sb nanoribbons of different terminations have shown the importance of external electric fields in the control of their electronic properties[32]; in nanoribbons with loss of inversion symmetry, the strong spin-orbit coupling (SOC) of Sb induces significant spin splittings in valence band maximum and conduction band minimum and the applied electric field together with the strong SOC allows the control of the bandgap size and, in the zigzag terminated ribbons, eventually induces a band inversion thereby electric-field modulation of carrier compensation is achieved with direct consequences for the magnetoresistance effect[32]
Summary
A. Thight Binding Hamiltonian of energy in agreement with first-principles results[4].The six Wannier functions per cell are a combination of the three p-orbitals centered on each Sb atoms, |px , |py and |pz , and can be expressed following reference 4 as:. Where HSO,p represents the Hamiltonian matrix elements for p-orbitals and HSO,w for Wannier functions. We follow here the tight-binding model developed in Ref. 4 which includes six orbitals, three for each Sb atom of the unit cell. This Hamiltonian, obtained by a parametrization based on the formalism of maximally localized Wannier functions, gives an accurate description of the electronic structure of antimonene in a wide range
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