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This content will become publicly available on May 25, 2018

Title: Sensitive Phonon-Based Probe for Structure Identification of 1T' MoTe 2

In this work, by combining transmission electron microscopy and polarized Raman spectroscopy for the 1T' MoTe 2 flakes with different thicknesses, we found that the polarization dependence of Raman intensity is given as a function of excitation laser wavelength, phonon symmetry, and phonon frequency, but has weak dependence on the flake thickness from few-layer to multilayer. Additionally, the frequency of Raman peaks and the relative Raman intensity are sensitive to flake thickness, which manifests Raman spectroscopy as an effective probe for thickness of 1T' MoTe 2. This work demonstrates that polarized Raman spectroscopy is a powerful and nondestructive method to quickly identify the crystal structure and thickness of 1T' MoTe 2 simultaneously, which opens up opportunities for the in situ probe of anisotropic properties and broad applications of this novel material.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ; ORCiD logo [4] ;  [5] ;  [6] ;  [7] ;  [3] ; ORCiD logo [1] ;  [2] ;  [8]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Electrical Engineering and Computer Science
  2. Tohoku Univ., Sendai (Japan). Dept. of Physics
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  4. Liaoning Shihua Univ., Fushun (China). Colege of Sciences
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics
  6. Saitama Univ. (Japan). Dept. of Chemistry
  7. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  8. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Electrical Engineering and Computer Science, Dept. of Physics
Publication Date:
Report Number(s):
BNL-114298-2017-JA
Journal ID: ISSN 0002-7863; R&D Project: MA015MACA; KC0201010; TRN: US1800311
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 139; Journal Issue: 25; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1412640