The effects of geometry, exchange and electric fields on transport properties of nonsymmetric T-shaped silicene nanoribbons
Abstract
We propose two types of nonsymmetric T-shaped silicene nanoribbons that show peculiar spin transport properties. In type I and II T-shaped silicene nanoribbons, we modulate the overall conductance to one lead by changing the size of another lead. In type I T-shaped silicene nanoribbons, the conductance from L lead to R lead increases, while the conductance from L lead to T lead decreases with the size of R lead. A conductance gap near the Fermi energy is observed in the conductance from L lead to semiconducting T lead. Taking into account the exchange field, the near-perfect spin polarization can be acquired with ease at the semiconducting T lead. The spin polarization of each lead can be controlled by modulating the size of lead, electric field and exchange field. Similar properties are observed in type II T-shaped silicene nanoribbons. Thus the T-shaped silicene nanoribbons can serve as the important components of spin polarized nanodevice and nanocircuits.
- Publication:
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Solid State Communications
- Pub Date:
- August 2018
- DOI:
- 10.1016/j.ssc.2018.03.016
- Bibcode:
- 2018SSCom.276...19G
- Keywords:
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- T-shaped silicene nanoribbons;
- Tight binding model;
- Spin-polarized transport