Metal to semiconductor transition in metallic transition metal dichalcogenides

Yan Li, Sefaattin Tongay, Qu Yue, Jun Kang, Junqiao Wu, Jingbo Li

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

We report on tuning the electronic and magnetic properties of metallic transition metal dichalcogenides (mTMDCs) by 2D to 1D size confinement. The stability of the mTMDC monolayers and nanoribbons is demonstrated by the larger binding energy compared to the experimentally available semiconducting TMDCs. The 2D MX2 (M = Nb, Ta; X = S, Se) monolayers are non-ferromagnetic metals and mechanically softer compared to their semiconducting TMDCs counterparts. Interestingly, mTMDCs undergo metal-to-semiconductor transition when the ribbon width approaches to ∼13 Å and ∼7 Å for zigzag and armchair edge terminations, respectively; then these ribbons convert back to metal when the ribbon widths further decrease. Zigzag terminated nanoribbons are ferromagnetic semiconductors, and their magnetic properties can also be tuned by hydrogen edge passivation, whereas the armchair nanoribbons are non-ferromagnetic semiconductors. Our results display that the mTMDCs offer a broad range of physical properties spanning from metallic to semiconducting and non-ferromagnetic to ferromagnetic that is ideal for applications where stable narrow bandgap semiconductors with different magnetic properties are desired.

Original languageEnglish (US)
Article number174307
JournalJournal of Applied Physics
Volume114
Issue number17
DOIs
StatePublished - Nov 7 2013
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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