Controlled dynamic screening of excitonic complexes in 2D semiconductors.
| Autor: | Klots AR; Department of Physics and Astronomy, Vanderbilt University, Nashville, TN-37235, USA., Weintrub B; Department of Physics and Astronomy, Vanderbilt University, Nashville, TN-37235, USA.; Department of Physics, Freie University, Berlin, 14195, Germany., Prasai D; Interdisciplinary Graduate Program in Materials Science, Vanderbilt University, Nashville, TN-37234, USA., Kidd D; Department of Physics and Astronomy, Vanderbilt University, Nashville, TN-37235, USA., Varga K; Department of Physics and Astronomy, Vanderbilt University, Nashville, TN-37235, USA., Velizhanin KA; Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM-87545, USA., Bolotin KI; Department of Physics and Astronomy, Vanderbilt University, Nashville, TN-37235, USA. bolotin@gmail.com.; Department of Physics, Freie University, Berlin, 14195, Germany. bolotin@gmail.com. |
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| Jazyk: | angličtina |
| Zdroj: | Scientific reports [Sci Rep] 2018 Jan 15; Vol. 8 (1), pp. 768. Date of Electronic Publication: 2018 Jan 15. |
| DOI: | 10.1038/s41598-017-18803-y |
| Abstrakt: | We report a combined theoretical/experimental study of dynamic screening of excitons in media with frequency-dependent dielectric functions. We develop an analytical model showing that interparticle interactions in an exciton are screened in the range of frequencies from zero to the characteristic binding energy depending on the symmetries and transition energies of that exciton. The problem of the dynamic screening is then reduced to simply solving the Schrodinger equation with an effectively frequency-independent potential. Quantitative predictions of the model are experimentally verified using a test system: neutral, charged and defect-bound excitons in two-dimensional monolayer WS |
| Databáze: | MEDLINE |
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