Exciton Vortices in Two-Dimensional Hybrid Perovskite Monolayers

We study theoretically the exciton Bose–Einstein condensation and exciton vortices in a two-dimensional (2D) perovskite (PEA) 2 PbI 4 monolayer. Combining the first-principles calculations and the Keldysh model, the exciton binding energy of in a (PEA) 2 PbI 4 monolayer can approach hundreds of meV,...

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Bibliographic Details
Published inChinese physics letters Vol. 37; no. 11; p. 117102
Main Authors Chen, Yingda, Zhang, Dong, Chang, Kai
Format Journal Article
LanguageEnglish
Published 01.11.2020
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Summary:We study theoretically the exciton Bose–Einstein condensation and exciton vortices in a two-dimensional (2D) perovskite (PEA) 2 PbI 4 monolayer. Combining the first-principles calculations and the Keldysh model, the exciton binding energy of in a (PEA) 2 PbI 4 monolayer can approach hundreds of meV, which make it possible to observe the excitonic effect at room temperature. Due to the large exciton binding energy, and hence the high density of excitons, we find that the critical temperature of the exciton condensation could approach the liquid nitrogen regime. In the presence of perpendicular electric fields, the dipole-dipole interaction between excitons is found to drive the condensed excitons confined in (PEA) 2 PbI 4 monolayer flakes into patterned vortices, as the evolution time of vortex patterns is comparable to the exciton lifetime.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/37/11/117102