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Title: H-point exciton transitions in bulk MoS{sub 2}

Abstract

Reflectance and photoreflectance spectrum of bulk MoS{sub 2} around its direct bandgap energy have been measured at 12 K. Apart from spectral features due to the A and B ground state exciton transitions at the K-point of the Brillouin zone, one observes additional features at nearby energies. Through lineshape analysis the character of two prominent additional features are shown to be quite different from that of A and B. By comparing with reported electronic band structure calculations, these two additional features are identified as ground state exciton transitions at the H-point of the Brillouin zone involving two spin-orbit split valance bands. The excitonic energy gap at the H-point is 1.965 eV with a valance bands splitting of 185 meV. While at the K-point, the corresponding values are 1.920 eV and 205 meV, respectively.

Authors:
;  [1]
  1. Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai 400005 (India)
Publication Date:
OSTI Identifier:
22399000
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BRILLOUIN ZONES; COMPARATIVE EVALUATIONS; ELECTRONIC STRUCTURE; ENERGY GAP; EV RANGE; EXCITONS; GROUND STATES; L-S COUPLING; MOLYBDENUM SULFIDES; SPECTRAL REFLECTANCE

Citation Formats

Saigal, Nihit, and Ghosh, Sandip, E-mail: sangho10@tifr.res.in. H-point exciton transitions in bulk MoS{sub 2}. United States: N. p., 2015. Web. doi:10.1063/1.4920986.
Saigal, Nihit, & Ghosh, Sandip, E-mail: sangho10@tifr.res.in. H-point exciton transitions in bulk MoS{sub 2}. United States. doi:10.1063/1.4920986.
Saigal, Nihit, and Ghosh, Sandip, E-mail: sangho10@tifr.res.in. Mon . "H-point exciton transitions in bulk MoS{sub 2}". United States. doi:10.1063/1.4920986.
@article{osti_22399000,
title = {H-point exciton transitions in bulk MoS{sub 2}},
author = {Saigal, Nihit and Ghosh, Sandip, E-mail: sangho10@tifr.res.in},
abstractNote = {Reflectance and photoreflectance spectrum of bulk MoS{sub 2} around its direct bandgap energy have been measured at 12 K. Apart from spectral features due to the A and B ground state exciton transitions at the K-point of the Brillouin zone, one observes additional features at nearby energies. Through lineshape analysis the character of two prominent additional features are shown to be quite different from that of A and B. By comparing with reported electronic band structure calculations, these two additional features are identified as ground state exciton transitions at the H-point of the Brillouin zone involving two spin-orbit split valance bands. The excitonic energy gap at the H-point is 1.965 eV with a valance bands splitting of 185 meV. While at the K-point, the corresponding values are 1.920 eV and 205 meV, respectively.},
doi = {10.1063/1.4920986},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 18,
volume = 106,
place = {United States},
year = {2015},
month = {5}
}