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Title: Trion formation dynamics in monolayer transition metal dichalcogenides

Here, we report charged exciton (trion) formation dynamics in doped monolayer transition metal dichalcogenides, specifically molybdenum diselenide (MoSe 2), using resonant two-color pump-probe spectroscopy. When resonantly pumping the exciton transition, trions are generated on a picosecond time scale through exciton-electron interaction. As the pump energy is tuned from the high energy to low energy side of the inhomogeneously broadened exciton resonance, the trion formation time increases by ~50%. This feature can be explained by the existence of both localized and delocalized excitons in a disordered potential and suggests the existence of an exciton mobility edge in transition metal dichalcogenides.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [2] ;  [1] ;  [1] ;  [2] ;  [4] ;  [4] ;  [1] ;  [5] ;  [5] ;  [4] ;  [6]
  1. Univ. of Texas, Austin, TX (United States)
  2. Univ. of Washington, Seattle, WA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  4. Technische Univ. Berlin, Berlin (Germany)
  5. Univ. of California, Riverside, CA (United States)
  6. Chalmers Univ. of Technology, Gothenburg (Sweden)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; SC0012670; SC0008145
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 4; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1261338
Alternate Identifier(s):
OSTI ID: 1234138

Singh, Akashay, Moody, Galan, Schaibley, John R., Yan, Jiaqiang, Mandrus, David G., Xu, Xiaodong, Li, Xiaoqun, Tran, Kha, Scott, Marie E., Overbeck, Vincent, Berghauser, Gunnar, Seifert, Edward J., Pleskot, Dennis, Gabor, Nathaniel M., Richter, Marten, and Malic, Ermin. Trion formation dynamics in monolayer transition metal dichalcogenides. United States: N. p., Web. doi:10.1103/PhysRevB.93.041401.
Singh, Akashay, Moody, Galan, Schaibley, John R., Yan, Jiaqiang, Mandrus, David G., Xu, Xiaodong, Li, Xiaoqun, Tran, Kha, Scott, Marie E., Overbeck, Vincent, Berghauser, Gunnar, Seifert, Edward J., Pleskot, Dennis, Gabor, Nathaniel M., Richter, Marten, & Malic, Ermin. Trion formation dynamics in monolayer transition metal dichalcogenides. United States. doi:10.1103/PhysRevB.93.041401.
Singh, Akashay, Moody, Galan, Schaibley, John R., Yan, Jiaqiang, Mandrus, David G., Xu, Xiaodong, Li, Xiaoqun, Tran, Kha, Scott, Marie E., Overbeck, Vincent, Berghauser, Gunnar, Seifert, Edward J., Pleskot, Dennis, Gabor, Nathaniel M., Richter, Marten, and Malic, Ermin. 2016. "Trion formation dynamics in monolayer transition metal dichalcogenides". United States. doi:10.1103/PhysRevB.93.041401. https://www.osti.gov/servlets/purl/1261338.
@article{osti_1261338,
title = {Trion formation dynamics in monolayer transition metal dichalcogenides},
author = {Singh, Akashay and Moody, Galan and Schaibley, John R. and Yan, Jiaqiang and Mandrus, David G. and Xu, Xiaodong and Li, Xiaoqun and Tran, Kha and Scott, Marie E. and Overbeck, Vincent and Berghauser, Gunnar and Seifert, Edward J. and Pleskot, Dennis and Gabor, Nathaniel M. and Richter, Marten and Malic, Ermin},
abstractNote = {Here, we report charged exciton (trion) formation dynamics in doped monolayer transition metal dichalcogenides, specifically molybdenum diselenide (MoSe2), using resonant two-color pump-probe spectroscopy. When resonantly pumping the exciton transition, trions are generated on a picosecond time scale through exciton-electron interaction. As the pump energy is tuned from the high energy to low energy side of the inhomogeneously broadened exciton resonance, the trion formation time increases by ~50%. This feature can be explained by the existence of both localized and delocalized excitons in a disordered potential and suggests the existence of an exciton mobility edge in transition metal dichalcogenides.},
doi = {10.1103/PhysRevB.93.041401},
journal = {Physical Review B},
number = 4,
volume = 93,
place = {United States},
year = {2016},
month = {1}
}