Engineering the Structural and Electronic Phases of MoTe2 through W Substitution
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
- Columbia Univ., New York, NY (United States). Dept. of Mechanical Engineering
- Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Materials Science and Engineering
- Stanford Univ., CA (United States). Dept. of Chemistry
- Columbia Univ., New York, NY (United States). Dept. of Applied Physics and Applied Mathematics
- Columbia Univ., New York, NY (United States). Dept. of Physics
- Stanford Univ., CA (United States). Dept. of Materials Science and Engineering
- Columbia Univ., New York, NY (United States). Materials Research Science and Engineering Center; State Univ. of New York (SUNY), New York, NY (United States). Fashion Inst. of Technology (FIT), Dept. of Science and Mathematics
- Army Research Lab., Adelphi, MD (United States). Sensors and Electronic Devices Directorate
- Stanford Univ., CA (United States). Dept. of Applied Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Inst. (PULSE)
- Columbia Univ., New York, NY (United States). Dept. of Electrical Engineering
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
- Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, and Inst. of Physics
- Renmin Univ. of China, Beijing (China). Dept. of Physics
- Columbia Univ., New York, NY (United States). Dept. of Electrical Engineering; Columbia Univ., New York, NY (United States). Dept. of Applied Physics and Applied Mathematics
- Columbia Univ., New York, NY (United States). Dept. of Chemistry; Columbia Univ., New York, NY (United States). Columbia Nano Initiative
- Stanford Univ., CA (United States). Dept. of Materials Science and Engineering; SLAC National Accelerator Lab., Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Inst. (PULSE); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
- Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Mechanical Science and Engineering
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
MoTe2 is an exfoliable transition metal dichalcogenide (TMD) that crystallizes in three symmetries: the semiconducting trigonal-prismatic 2H- or α-phase, the semimetallic and monoclinic 1T'- or β-phase, and the semimetallic orthorhombic γ-structure. The 2H-phase displays a band gap of ~1 eV making it appealing for flexible and transparent optoelectronics. The γ-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 xc ~ 8% stabilizes the γ-phase at room temperature. Lastly, this suggests that crystals with x close to xc might be particularly susceptible to phase transformations induced by an external perturbation, for example, an electric field. Photoemission spectroscopy, indicates that the γ-phase possesses a Fermi surface akin to that of WTe2.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704; 2013CB921700; 2015CB921300; W911NF-11-1-0362; GBMF4545; AC02-76SF00515; FA9550-11-1-0010; FA9550-14-1-0268; NA0002135; FG02-04ER46157; 11234014; 11274381; 11474340; DMR-1610110; XDB07000000; LPDS 2013-13
- OSTI ID:
- 1353195
- Journal Information:
- Nano Letters, Vol. 17, Issue 3; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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