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Abstract
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Edge states of a few-layer silicene nanoribbon (FSNR) have potential applications in spintronic and nanodevices.
Quantum transport properties of zigzag superlattice FSNR exposed to vertical electric field and Rashba spin-orbit
coupling (RSOC) are studied within the tight-binding based non-equilibrium Green’s function approach. In
addition, the topological insulator-band insulator phase transition of FSNR and the influence of adding a new
layer on edge states of conduction electrons have been investigated. Calculations demonstrate that the external
electric field applied perpendicularly to the FSNR device, results in gap opening and metal-semiconductor and
metal-semimetal phase transition. Further, we found that different topological phase transitions, quasitopological
insulator-band insulator and topological insulator-band insulator by applying a vertical electric
field. Meanwhile, results reveal that by tuning the RSOC strength, we can control the spin current. This
controllability of spin and quantum transport in FSNR may contribute to potential applications in silicene-based
devices and the development of spintronic.
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