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Title: Structural, electronic and vibrational properties of few-layer 2H-and 1T-TaSe2

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep16646· OSTI ID:1287019
 [1];  [1];  [2];  [3]
  1. Towson Univ., Towson, MD (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Vanderbilt Univ., Nashville, TN (United States)

Two-dimensional metallic transition metal dichalcogenides (TMDs) are of interest for studying phenomena such as charge-density wave (CDW) and superconductivity. Few-layer tantalum diselenides (TaSe2) are typical metallic TMDs exhibiting rich CDW phase transitions. However, a description of the structural, electronic and vibrational properties for different crystal phases and stacking configurations, essential for interpretation of experiments, is lacking. We present first principles calculations of structural phase energetics, band dispersion near the Fermi level, phonon properties and vibrational modes at the Brillouin zone center for different layer numbers, crystal phases and stacking geometries. Evolution of the Fermi surfaces as well as the phonon dispersions as a function of layer number reveals dramatic dimensionality effects in this CDW material. Lastly, our results indicate strong electronic interlayer coupling, detail energetically possible stacking geometries, and provide a basis for interpretation of Raman spectra.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1287019
Journal Information:
Scientific Reports, Vol. 5; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (13)

Light emission from the layered metal 2H-TaSe2 and its potential applications journal July 2019
Distinct spin–lattice and spin–phonon interactions in monolayer magnetic CrI 3 journal January 2018
Observation of charge density waves in free-standing 1T-TaSe 2 monolayers by transmission electron microscopy journal October 2018
Dimensional reduction and ionic gating induced enhancement of superconductivity in atomically thin crystals of 2H-TaSe 2 journal November 2018
Electron–phonon interaction and transport properties of metallic bulk and monolayer transition metal dichalcogenide TaS 2 journal October 2017
Ballistic thermoelectric properties of monolayer semiconducting transition metal dichalcogenides and oxides journal August 2019
Stable charge density wave phase in a 1 T TiSe 2 monolayer journal June 2017
Charge density wave states in tantalum dichalcogenides journal January 2018
Phonon origin and lattice evolution in charge density wave states journal May 2019
Short-range charge density wave order in 2 H T a S 2 journal June 2019
Strain-controlled magnetic and optical properties of monolayer 2 H TaS e 2 journal August 2019
Ion intercalation engineering of electronic properties of two-dimensional crystals of 2 H TaSe 2 journal October 2019
Electron-phonon interaction and transport properties of metallic bulk and monolayer transition metal dichalcogenide TaS$_2$ text January 2017

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