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Title: Raman spectroscopy of transition metal dichalcogenides

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 28; Journal Issue: 35; Related Information: CHORUS Timestamp: 2017-06-24 13:59:20; Journal ID: ISSN 0953-8984
IOP Publishing
Country of Publication:
United Kingdom

Citation Formats

Saito, R., Tatsumi, Y., Huang, S., Ling, X., and Dresselhaus, M. S.. Raman spectroscopy of transition metal dichalcogenides. United Kingdom: N. p., 2016. Web. doi:10.1088/0953-8984/28/35/353002.
Saito, R., Tatsumi, Y., Huang, S., Ling, X., & Dresselhaus, M. S.. Raman spectroscopy of transition metal dichalcogenides. United Kingdom. doi:10.1088/0953-8984/28/35/353002.
Saito, R., Tatsumi, Y., Huang, S., Ling, X., and Dresselhaus, M. S.. Thu . "Raman spectroscopy of transition metal dichalcogenides". United Kingdom. doi:10.1088/0953-8984/28/35/353002.
title = {Raman spectroscopy of transition metal dichalcogenides},
author = {Saito, R. and Tatsumi, Y. and Huang, S. and Ling, X. and Dresselhaus, M. S.},
abstractNote = {},
doi = {10.1088/0953-8984/28/35/353002},
journal = {Journal of Physics. Condensed Matter},
number = 35,
volume = 28,
place = {United Kingdom},
year = {Thu Jul 07 00:00:00 EDT 2016},
month = {Thu Jul 07 00:00:00 EDT 2016}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1088/0953-8984/28/35/353002

Citation Metrics:
Cited by: 17works
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  • The photocurrent spectra of single crystals of the semiconducting group VI transition metal dichalcogenides (MoS/sub 2/, WS/sub 2/, WSe/sub 2/, and MoSe/sub 2/) were measured as a function of crystal orientation and surface morphology as well as the polarization and the angle of incidence of the incident radiation. The spectra were analyzed with a band edge analysis revised to include the diffusion of carriers, and estimates of the transition energies were obtained. Structure corresponding to the excitonic transitions was also observed. The results were discussed with respect to the applicability of these materials to solar energy conversion.
  • Cited by 20
  • We discuss the linear and two-photon spectroscopic selection rules for spin-singlet excitons in monolayer transition-metal dichalcogenides. Our microscopic formalism combines a fully k-dependent few-orbital band structure with a many-body Bethe-Salpeter equation treatment of the electron-hole interaction, using a model dielectric function. We show analytically and numerically that the single-particle, valley-dependent selection rules are preserved in the presence of excitonic effects. Furthermore, we definitively demonstrate that the bright (one-photon allowed) excitons have s-type azimuthal symmetry and that dark p-type excitons can be probed via two-photon spectroscopy. Thus, the screened Coulomb interaction in these materials substantially deviates from the 1/ε₀r form; thismore » breaks the “accidental” angular momentum degeneracy in the exciton spectrum, such that the 2p exciton has a lower energy than the 2s exciton by at least 50 meV. We compare our calculated two-photon absorption spectra to recent experimental measurements.« less
  • We report on tuning the electronic and magnetic properties of metallic transition metal dichalcogenides (mTMDCs) by 2D to 1D size confinement. The stability of the mTMDC monolayers and nanoribbons is demonstrated by the larger binding energy compared to the experimentally available semiconducting TMDCs. The 2D MX{sub 2} (M = Nb, Ta; X = S, Se) monolayers are non-ferromagnetic metals and mechanically softer compared to their semiconducting TMDCs counterparts. Interestingly, mTMDCs undergo metal-to-semiconductor transition when the ribbon width approaches to ∼13 Å and ∼7 Å for zigzag and armchair edge terminations, respectively; then these ribbons convert back to metal when the ribbon widths further decrease. Zigzag terminatedmore » nanoribbons are ferromagnetic semiconductors, and their magnetic properties can also be tuned by hydrogen edge passivation, whereas the armchair nanoribbons are non-ferromagnetic semiconductors. Our results display that the mTMDCs offer a broad range of physical properties spanning from metallic to semiconducting and non-ferromagnetic to ferromagnetic that is ideal for applications where stable narrow bandgap semiconductors with different magnetic properties are desired.« less