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Title: First-principles study of mechanical and electronic properties of bent monolayer transition metal dichalcogenides

Abstract

The mechanical and electronic properties of transition metal dichalcogenide (TMD) monolayers corresponding to transition groups IV, VI, and X are explored under mechanical bending from first principles calculations using the strongly constrained and appropriately normed (SCAN) meta-GGA. SCAN provides an accurate description of the phase stability of the TMD monolayers. Our calculated lattice parameters and other structural parameters agree well with experiment. We find that bending stiffness (or flexural rigidity) increases as the transition metal group goes from IV to X to VI, with the exception of PdTe2. Variation in mechanical properties (local strain, physical thickness) and electronic properties (local charge density, band structure) with bending curvature is discussed. The local strain profile of these TMD monolayers under mechanical bending is highly nonuniform. The mechanical bending tunes not only the thickness of the TMD monolayers, but also the local charge distribution as well as the band structures, adding more functionalization options to these materials.

Authors:
ORCiD logo [1];  [2];  [1];  [1]
  1. Temple Univ., Philadelphia, PA (United States)
  2. Univ. of Maine, Orono, ME (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Complex Materials from First Principles (CCM); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Temple Univ., Philadelphia, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1577685
Alternate Identifier(s):
OSTI ID: 1546471
Grant/Contract Number:  
SC0012575
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 7; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Materials Science; Electronic structure of atoms & molecules; First-principles calculations; Condensed Matter & Materials Physics

Citation Formats

Nepal, Niraj K., Yu, Liping, Yan, Qimin, and Ruzsinszky, Adrienn. First-principles study of mechanical and electronic properties of bent monolayer transition metal dichalcogenides. United States: N. p., 2019. Web. doi:10.1103/physrevmaterials.3.073601.
Nepal, Niraj K., Yu, Liping, Yan, Qimin, & Ruzsinszky, Adrienn. First-principles study of mechanical and electronic properties of bent monolayer transition metal dichalcogenides. United States. https://doi.org/10.1103/physrevmaterials.3.073601
Nepal, Niraj K., Yu, Liping, Yan, Qimin, and Ruzsinszky, Adrienn. Mon . "First-principles study of mechanical and electronic properties of bent monolayer transition metal dichalcogenides". United States. https://doi.org/10.1103/physrevmaterials.3.073601. https://www.osti.gov/servlets/purl/1577685.
@article{osti_1577685,
title = {First-principles study of mechanical and electronic properties of bent monolayer transition metal dichalcogenides},
author = {Nepal, Niraj K. and Yu, Liping and Yan, Qimin and Ruzsinszky, Adrienn},
abstractNote = {The mechanical and electronic properties of transition metal dichalcogenide (TMD) monolayers corresponding to transition groups IV, VI, and X are explored under mechanical bending from first principles calculations using the strongly constrained and appropriately normed (SCAN) meta-GGA. SCAN provides an accurate description of the phase stability of the TMD monolayers. Our calculated lattice parameters and other structural parameters agree well with experiment. We find that bending stiffness (or flexural rigidity) increases as the transition metal group goes from IV to X to VI, with the exception of PdTe2. Variation in mechanical properties (local strain, physical thickness) and electronic properties (local charge density, band structure) with bending curvature is discussed. The local strain profile of these TMD monolayers under mechanical bending is highly nonuniform. The mechanical bending tunes not only the thickness of the TMD monolayers, but also the local charge distribution as well as the band structures, adding more functionalization options to these materials.},
doi = {10.1103/physrevmaterials.3.073601},
journal = {Physical Review Materials},
number = 7,
volume = 3,
place = {United States},
year = {Mon Jul 15 00:00:00 EDT 2019},
month = {Mon Jul 15 00:00:00 EDT 2019}
}

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