Probing many-body interactions in monolayer transition-metal dichalcogenides
Abstract
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.
- Authors:
-
- Univ. of Rochester, NY (United States)
- State Univ. of New York (SUNY), Buffalo, NY (United States); Univ. of Regensburg (Germany); Univ. of Wurzburg (Germany)
- Pennsylvania State Univ., University Park, PA (United States)
- State Univ. of New York (SUNY), Buffalo, NY (United States)
- Publication Date:
- Research Org.:
- 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 Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1610763
- Alternate Identifier(s):
- OSTI ID: 1493105
- Grant/Contract Number:
- SC0004890; SC0012635; SC0013883; SC0014349; DMR-1410407; DESC0013883
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 8; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials science; Physics; Excitons; Semiconductors; Valleytronics; Monolayer films; Transition-metal dichalcogenide
Citation Formats
Van Tuan, Dinh, Scharf, Benedikt, Wang, Zefang, Shan, Jie, Mak, Kin Fai, Žutić, Igor, and Dery, Hanan. Probing many-body interactions in monolayer transition-metal dichalcogenides. United States: N. p., 2019.
Web. doi:10.1103/physrevb.99.085301.
Van Tuan, Dinh, Scharf, Benedikt, Wang, Zefang, Shan, Jie, Mak, Kin Fai, Žutić, Igor, & Dery, Hanan. Probing many-body interactions in monolayer transition-metal dichalcogenides. United States. https://doi.org/10.1103/physrevb.99.085301
Van Tuan, Dinh, Scharf, Benedikt, Wang, Zefang, Shan, Jie, Mak, Kin Fai, Žutić, Igor, and Dery, Hanan. Fri .
"Probing many-body interactions in monolayer transition-metal dichalcogenides". United States. https://doi.org/10.1103/physrevb.99.085301. https://www.osti.gov/servlets/purl/1610763.
@article{osti_1610763,
title = {Probing many-body interactions in monolayer transition-metal dichalcogenides},
author = {Van Tuan, Dinh and Scharf, Benedikt and Wang, Zefang and Shan, Jie and Mak, Kin Fai and Žutić, Igor and Dery, Hanan},
abstractNote = {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.},
doi = {10.1103/physrevb.99.085301},
journal = {Physical Review B},
number = 8,
volume = 99,
place = {United States},
year = {Fri Feb 01 00:00:00 EST 2019},
month = {Fri Feb 01 00:00:00 EST 2019}
}
Web of Science
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