Valleytronics in Tin (II) Sulfide

TL;DR

This paper investigates the valley properties and optical selection rules of two-dimensional tin (II) sulfide, revealing its potential as a novel material for valleytronics applications due to its unique valley configurations and optical characteristics.

Contribution

The study combines ab initio calculations and k·p theory to demonstrate the valleytronic potential of 2D SnS, highlighting its unique valley placement and optical selection capabilities.

Findings

SnS has pairs of equivalent valleys along perpendicular axes.

Valleys can be selectively excited with linearly polarized light.

Valleys can be separated via non-local electrical measurements.

Abstract

Tin (II) sulfide (SnS) is a layered mineral found in nature. In this paper, we study the two-dimensional form of this material using a combination of \emph{ab initio} calculation and $\mathbf{k}\cdot\mathbf{p}$ theory. In particular, we address the valley properties and the optical selection rules of 2D SnS. Our study reveals SnS as an extraordinary material for valleytronics, where pairs of equivalent valleys are placed along two perpendicular axes, can be selected exclusively with linear polarized light, and can be separated using non-local electrical measurements.