Issue 4, 2019

Two-dimensional spin–valley-coupled Dirac semimetals in functionalized SbAs monolayers

Abstract

In the presence of spin–orbit coupling (SOC), achieving both spin and valley polarized Dirac states is significant to promote the fantastic integration of Dirac physics, spintronics and valleytronics. Based on ab initio calculations, here we demonstrate that a class of spin–valley-coupled Dirac semimetals (svc-DSMs) in functionalized SbAs monolayers (MLs) can host such desired states. Distinguished from the graphene-like 2D Dirac materials, Dirac cones in svc-DSMs hold giant spin-splitting induced by strong SOC under inversion symmetry breaking. In 2.3% strained SbAsH2 MLs, Dirac fermions in inequivalent valleys have opposite Berry curvature and spin moment, giving rise to a Dirac spin–valley Hall effect with constant spin Hall conductivity as well as massless and dissipationless transport. Topological analysis reveals that the svc-DSM emerges at the boundary between trivial and 2D topological insulators, which provides a promising platform for realizing flexible and controllable tuning among different quantum states.

Graphical abstract: Two-dimensional spin–valley-coupled Dirac semimetals in functionalized SbAs monolayers

Supplementary files

Article information

Article type
Communication
Submitted
11 12 2018
Accepted
15 1 2019
First published
15 1 2019

Mater. Horiz., 2019,6, 781-787

Two-dimensional spin–valley-coupled Dirac semimetals in functionalized SbAs monolayers

Z. Liu, W. Feng, H. Xin, Y. Gao, P. Liu, Y. Yao, H. Weng and J. Zhao, Mater. Horiz., 2019, 6, 781 DOI: 10.1039/C8MH01588K

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements