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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 (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.
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:
OSTI Identifier:
1261338
Grant/Contract Number:
AC05-00OR22725
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 Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY