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Title: Probing many-body interactions in monolayer transition-metal dichalcogenides

Journal Article · · Physical Review B
 [1];  [2];  [3];  [3];  [3];  [4];  [1]
  1. Univ. of Rochester, NY (United States)
  2. State Univ. of New York (SUNY), Buffalo, NY (United States); Univ. of Regensburg (Germany); Univ. of Wurzburg (Germany)
  3. Pennsylvania State Univ., University Park, PA (United States)
  4. State Univ. of New York (SUNY), Buffalo, NY (United States)

Many-body interactions in monolayer transition-metal dichalcogenides are strongly affected by their unique band structure. We study these interactions by measuring the energy shift of neutral excitons (bound electron-hole pairs) in gated WSe2 and MoSe2. Surprisingly, while the blueshift of the neutral exciton X0 in electron-doped samples can be more than 10 meV, the blueshift in hole-doped samples is nearly absent. Taking into account dynamical screening and local-field effects, we present a transparent and analytical model that elucidates the crucial role played by intervalley plasmons in electron-doped conditions. Here, the energy shift of X0 as a function of charge density is computed showing agreement with experiment, where the renormalization of X0 by intervalley plasmons yields a stronger blueshift in MoSe2 than in WSe2 due to differences in their band ordering.

Research Organization:
State Univ. of New York (SUNY), Albany, NY (United States); Univ. of South Florida, Tampa, FL (United States); Pennsylvania State Univ., University Park, PA (United States); Univ. of Rochester, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0004890; SC0012635; SC0013883; SC0014349; DMR-1410407; DESC0013883
OSTI ID:
1610763
Alternate ID(s):
OSTI ID: 1493105
Journal Information:
Physical Review B, Vol. 99, Issue 8; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 52 works
Citation information provided by
Web of Science

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  • Stier, Andreas V.; McCreary, Kathleen M.; Jonker, Berend T.
  • Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena, Vol. 34, Issue 4 https://doi.org/10.1116/1.4948992
journal July 2016
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Cited By (10)

Multiphonon Raman Scattering in Transition Metal Dichalcogenide Double Layers journal January 2020
Dynamical screening in monolayer transition-metal dichalcogenides and its manifestations in the exciton spectrum journal March 2019
Nonlinear excitonic spin Hall effect in monolayer transition metal dichalcogenides journal October 2019
Magnetic field mixing and splitting of bright and dark excitons in monolayer MoSe 2 journal November 2019
Exciton states and absorption spectra in freestanding monolayer transition metal dichalcogenides: A variationally optimized diagonalization method journal September 2019
Multiphonon Raman scattering mediated by the exciton states in monolayer transition metal chalcogenides journal September 2019
Excited-State Trions in Monolayer WS 2 journal October 2019
Coherent feedback control of two-dimensional excitons journal January 2020
Dynamical screening in monolayer transition-metal dichalcogenides and its manifestations in the exciton spectrum text January 2018
Nonlinear excitonic spin Hall effect in monolayer transition metal dichalcogenides preprint January 2018