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Title: Revealing excitonic processes and chemical bonding in Mo S 2 by x-ray spectroscopy

Journal Article · · Physical Review B
 [1];  [1];  [2];  [3];  [1];  [4];  [5]
  1. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Materials Measurement Science Division, Material Measurement Laboratory
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Materials Characterization Department
  4. Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin (France)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Sensor Science Division, Physical Measurement Laboratory

Electron core-hole processes at absorption edges sport several signatures, primarily in the form of bound states and/or excitonic enhancement. Here, through analysis of the resonant-Raman Auger effect for the two-dimensional transition-metal dichalcogenide MoS2, we demonstrate that these effects have significant manifestations at the S K edge. We characterize two asymmetric excitonically enhanced edges: one at the fundamental band edge and one several electron volts above it following a second band gap that lies entirely within the unoccupied states, with the latter revealing an anomalous postcollision interaction effect. In conclusion, our interpretation is supported by comparison of both the photoemission valence-band spectrum and the S K-edge x-ray-absorption spectrum with electronic structure calculations and an ab initio solution of the Bethe-Salpeter equation that accurately accounts for the electron-core-hole interaction.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; AC02-98CH10886
OSTI ID:
1481401
Report Number(s):
BNL-209423-2018-JAAM; PRBMDO
Journal Information:
Physical Review B, Vol. 98, Issue 11; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Figures / Tables (7)