Journal
NANO LETTERS
Volume 17, Issue 3, Pages 1616-1622Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b04814
Keywords
Transition-metal-dichalcogenides; phase-transformations; Weyl semimetals; electron microscopy; Raman spectroscopy; photoemission spectroscopy
Categories
Funding
- U.S. Army Research Office MURI [W911NF-11-1-0362]
- Molecular and Electronic Nanostructures theme of the Beckman Institute at UIUC
- U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
- U.S. Department of Energy [DE-FG 02-04-ER-46157]
- German National Academy of Sciences Leopoldina [LPDS 2013-13]
- DOE-BES, Materials Sciences and Engineering Division [DEACO2-76SF00515]
- W. M. Keck Foundation
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4545]
- AFOSR [FA9550-14-1-0268, FA955011-1-0010]
- National Natural Science Foundation of China [11274381, 11474340, 11234014]
- Ministry of Science and Technology of China [2015CB921300, 2013CB921700]
- Chinese Academy of Sciences [XDB07000000]
- NSF [DMR-1610110, NSF-DMR-1157490]
- United States Department of Energy Office of Science [DE-SC0012704]
- State of Florida
- [DE-NA0002135]
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MoTe2 is an exfoliable transition metal dichalcogenide (TMD) that crystallizes in three symmetries: the semi-conducting trigonal-prismatic 2H- or alpha-phase, the semimetallic and monoclinic 1T'- or beta-phase, and the semimetallic orthorhombic gamma-structure. The 2H-phase displays a band gap of similar to 1 eV making it appealing for flexible and transparent optoelectronics. The gamma-phase is predicted to possess unique topological properties that might lead to topologically protected nondissipative transport channels. Recently, it was argued that it is possible to locally induce phase-transformations in TMDs, through chemical doping, local heating or electric-field to achieve ohmic contacts or to induce useful functionalities such as electronic phase-change memory elements. The combination of semiconducting and topological elements based upon the same compound might produce a new generation of high performance, low dissipation optoelectronic elements. Here, we show that it is possible to engineer the phases of MoTe2 through W substitution by unveiling the phase-diagram of the Mo1-xWxTe2 solid solution, which displays a semiconducting to semimetallic transition as a function of x. We find that a small critical W concentration x(c) similar to 8% stabilizes the gamma-phase at room temperature. This suggests that crystals with x close to x(c) might be particularly susceptible to phase transformations induced by an external perturbation, for example, an electric field. Photoemission spectroscopy, indicates that the gamma-phase possesses a Fermi surface akin to that of WTe2.
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