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First Principles Evaluation of Topologically Protected Edge States in MoS2 1T′ Nanoribbons with Realistic Terminations

Authors :
Heribert Seiler
Viktor Sverdlov
Al-Moatasem El-Sayed
Dominic Waldhor
Markus Jech
Hans Kosina
Source :
2021 Joint International EUROSOI Workshop and International Conference on Ultimate Integration on Silicon (EuroSOI-ULIS).
Publication Year :
2021
Publisher :
IEEE, 2021.

Abstract

Exploiting novel materials with advanced properties is necessary to improve device performance and continue with their scaling for high performance applications at reduced power. Among these materials, topological insulators (TIs) present an exciting opportunity where the highly conductive edge states, which are protected against back scattering, can lead to advances in electronic as well as spin controlled devices. Here, we present first principles results that evaluate topologically protected edge states in MoS 2 nanoribbons. We vary the width of the nanoribbons and show that they transition to trivial insulators below a critical width. Furthermore, the trivial insulator can be a direct or indirect band gap insulator depending on the width and the edge termination. Our results show that including realistic edge terminations can provide valuable insight, especially for narrow width TIs.

Details

Database :
OpenAIRE
Journal :
2021 Joint International EUROSOI Workshop and International Conference on Ultimate Integration on Silicon (EuroSOI-ULIS)
Accession number :
edsair.doi...........742d28df91013de41149dfa87147df98
Full Text :
https://doi.org/10.1109/eurosoi-ulis53016.2021.9560183