Thickness dependent electronic structure of exfoliated mono- and few-layer 1T′-MoTe2

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • A. S. Pawlik - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • S. Aswartham - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • I. Morozov - , Leibniz Institute for Solid State and Materials Research Dresden, Lomonosov Moscow State University (Author)
  • M. Knupfer - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • B. Büchner - , Chair of Experimental Solid State Physics, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • D. V. Efremov - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • A. Koitzsch - , Leibniz Institute for Solid State and Materials Research Dresden (Author)

Abstract

Semimetallic MoTe2 has recently generated enormous attention due to its topological properties, large magnetoresistance, superconductivity, suitability for homojunction phase patterning, and, in particular, metal-insulator transition of thin layers, possibly indicating a quantum spin hall state. These observations prove the potential of MoTe2 for thin film applications and call for systematic investigations of the thickness dependent electronic structure. Here we apply angle-resolved photoemission spectroscopy supported by band structure calculations to elucidate the electronic structure of exfoliated 1T′-MoTe2. Electron and hole pockets of the inverted conduction and valence bands near Γ are resolved down to the monolayer. The Fermi level of exfoliated 1T′-MoTe2 monolayers lays within the electron pockets indicating intrinsic n-type doping. EF shifts downward with increasing thickness consistent with a surface driven mechanism. Our study provides insight on the electronic properties of semimetallic 1T′-MoTe2 as an indispensable ingredient for future thin film functionalization.

Details

Original languageEnglish
Article number104004
JournalPhysical review materials
Volume2
Issue number10
Publication statusPublished - 26 Oct 2018
Peer-reviewedYes