Geometrical and electrical modulation on the transport property of silicene constrictions

TL;DR

This paper investigates how geometrical and electrical modifications influence the transport properties of silicene constrictions, revealing methods to enhance conductance through structural symmetry and novel two-channel designs.

Contribution

It introduces a new approach to modulate silicene transport properties using geometrical and electrical tuning, including the design of a two-channel structure for improved conductance.

Findings

Conductance depends on the position and width of the constriction.

Symmetrical structures induce resonance effects that enhance conductance.

Two-channel structures outperform one-channel counterparts in conductance.

Abstract

We study the electrical modulation of the transport properties of silicene constrictions with different geometrical structures by adopting the tight-binding model and non-equilibrium Green's function method. The band structure and transmission properties are discussed under the influence of the external electric field and potential energy. Especially, we investigate the effects of the position and width of the central scattering region on the conductance with increasing of Fermi energy. We find that the conductance significantly depends on the position and the width. Interestingly, the symmetrical structure of the central region can induce a resonance effect and significantly enlarge the system's conductance. Obviously, we obtain an effective method to adjust the transport property of the silicene heterojunctions. Correspondingly, we propose a novel two-channel structure with an excellent performance on the conductance compared to the one-channel structure with the same total width.