Opin vísindi

Exciton-exciton interaction in transition-metal dichalcogenide monolayers

Exciton-exciton interaction in transition-metal dichalcogenide monolayers

Title: Exciton-exciton interaction in transition-metal dichalcogenide monolayers
Author: Shahnazaryan, Vanik   orcid.org/0000-0001-7892-0550
Iorsh, Ivan   orcid.org/0000-0003-4992-6122
Shelykh, Ivan   orcid.org/0000-0001-5393-821X
Kyriienko, O.
Date: 2017-09-06
Language: English
Scope: 115409
University/Institute: Háskóli Íslands
University of Iceland
School: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Department: Raunvísindastofnun (HÍ)
Science Institute (UI)
Series: Physical Review B;96(11)
ISSN: 2469-9950
2469-9969 (eISSN)
DOI: 10.1103/PhysRevB.96.115409
Subject: Excitons; Transition-metal dichalcogenide; Variational wave functional methods; Condensed Matter & Materials Physics; Þéttefnisfræði; Rafeindir; Rafeindafræði
URI: https://hdl.handle.net/20.500.11815/1038

Show full item record


Shahnazaryan, V., Iorsh, I., Shelykh, I. A., & Kyriienko, O. (2017). Exciton-exciton interaction in transition-metal dichalcogenide monolayers. Physical Review B, 96(11), 115409. doi:10.1103/PhysRevB.96.115409


We study theoretically the Coulomb interaction between excitons in transition metal dichalcogenide (TMD) monolayers. We calculate direct and exchange interaction for both ground and excited states of excitons. The screening of the Coulomb interaction, specific to monolayer structures, leads to the unique behavior of the exciton-exciton scattering for excited states, characterized by the nonmonotonic dependence of the interaction as function of the transferred momentum. We find that the nontrivial screening enables the description of TMD exciton interaction strength by approximate formula which includes exciton binding parameters. The influence of screening and dielectric environment on the exciton-exciton interaction was studied, showing qualitatively different behavior for ground state and excited states of excitons. Furthermore, we consider exciton-electron interaction, which for the excited states is governed by the dominant attractive contribution of the exchange component, which increases with the excitation number. The results provide a quantitative description of the exciton-exciton and exciton-electron scattering in transition metal dichalcogenides, and are of interest for the design of perspective nonlinear optical devices based on TMD monolayers.


Publisher's version (útgefin grein)

Files in this item

This item appears in the following Collection(s)