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Phonon-exciton Interactions in WSe2 under a quantizing magnetic field

Journal Article · · Nature Communications
 [1];  [2];  [2];  [3];  [4];  [5];  [2];  [2];  [6];  [7];  [7];  [6];  [8];  [9];  [3];  [10]
  1. Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Chemical and Biological Engineering; OSTI
  2. Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Chemical and Biological Engineering
  3. Univ. of Texas at Dallas, Richardson, TX (United States). Dept. of Physics
  4. National High Magnetic Field Lab., Tallahassee, FL (United States); Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
  5. Cornell Univ., Ithaca, NY (United States). Kavli Inst.
  6. Arizona State Univ., Tempe, AZ (United States). School for Engineering of Matter, Transport and Energy
  7. National Inst. for Materials Science (NIMS), Tsukuba (Japan)
  8. Univ. of Hong Kong (Hong Kong). Dept. of Physics
  9. National High Magnetic Field Lab., Tallahassee, FL (United States)
  10. Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Chemical and Biological Engineering. Dept. of Electrical, Computer & Systems Engineering
+ Show Author Affiliations
Strong many-body interaction in two-dimensional transitional metal dichalcogenides provides a unique platform to study the interplay between different quasiparticles, such as prominent phonon replica emission and modified valley-selection rules. A large out-of-plane magnetic field is expected to modify the exciton-phonon interactions by quantizing excitons into discrete Landau levels, which is largely unexplored. Here, we observe the Landau levels originating from phonon-exciton complexes and directly probe exciton-phonon interaction under a quantizing magnetic field. Phonon-exciton interaction lifts the inter-Landau-level transition selection rules for dark trions, manifested by a distinctively different Landau fan pattern compared to bright trions. This allows us to experimentally extract the effective mass of both holes and electrons. The onset of Landau quantization coincides with a significant increase of the valley-Zeeman shift, suggesting strong many-body effects on the phonon-exciton interaction. Our work demonstrates monolayer WSe2 as an intriguing playground to study phonon-exciton interactions and their interplay with charge, spin, and valley.
Research Organization:
Arizona State Univ., Tempe, AZ (United States); Florida State Univ., Tallahassee, FL (United States); National High Magnetic Field Lab., Tallahassee, FL (United States); National Inst. for Materials Science (NIMS), Tsukuba (Japan); Rensselaer Polytechnic Inst., Troy, NY (United States); Univ. of Texas at Dallas, Richardson, TX (United States)
Sponsoring Organization:
Air Force Office of Scientific Research (AFOSR); Army Research Office (ARO); Ministry of Education, Culture, Sports, Science and Technology (MEXT); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-07ER46451
OSTI ID:
1647005
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
Fluorescence spectroscopy
Two-dimensional materials