Isotope Effect in Bilayer WSe2

Wu, Wei; Morales-Acosta, Mayra Daniela; Wang, Yongqiang; Pettes, Michael Thompson

doi:10.1021/acs.nanolett.8b04269

Title: Isotope Effect in Bilayer WSe₂

Journal Article · 11 February 2019 · Nano Letters

DOI: https://doi.org/10.1021/acs.nanolett.8b04269 · OSTI ID:1499358

Wu, Wei ^[1]; Morales-Acosta, Mayra Daniela ^[2]; Wang, Yongqiang ^[3];

^[4]

Univ. of Connecticut, Storrs, CT (United States). Dept. of Mechanical Engineering, and Inst. of Materials Science
Univ. of Connecticut, Storrs, CT (United States).Inst. of Materials Science
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Connecticut, Storrs, CT (United States). Dept. of Mechanical Engineering, and Inst. of Materials Science; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Isotopes of an element have the same electron number but differ in neutron number and atomic mass. However, due to the thickness-dependent properties in MX₂ (M = Mo, W; X = S, Se, Te) transition metal dichalcogenides (TMDs), the isotopic effect in atomically thin TMDs still remains unclear especially for phonon-assisted indirect excitonic transitions. Here, we report the first observation of the isotope effect on the electronic and vibrational properties of a TMD material, using naturally abundant ^NAW^NASe₂ and isotopically pure ¹⁸⁶W⁸⁰Se₂ bilayer single crystals over a temperature range of 4.4–300 K. We demonstrate a higher optical band gap energy in ¹⁸⁶W⁸⁰Se₂ than in ^NAW^NASe₂ (3.9 ± 0.7 meV from 4.41 to 300 K), which is surprising as isotopes are neutral impurities. Phonon energies decrease in the isotopically pure crystal due to the atomic mass dependence of harmonic oscillations, with correspondingly longer E_2g and A²_1g phonon lifetimes than in the naturally abundant sample. Finally, the change in electronic band gap renormalization energy is postulated as being the dominant mechanism responsible for the change in optical emission spectra.

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Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1499358

Report Number(s):: LA-UR-18-29405

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 3 Vol. 19; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Isotope engineering
Material Science
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band gap engineering
photoluminescence
transition metal dichalcogenide
tungsten diselenide

Title: Isotope Effect in Bilayer WSe2

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Title: Isotope Effect in Bilayer WSe₂