Journal article
Optical shaping of the polarization anisotropy in a laterally coupled quantum dot dimer
- Abstract:
- We find that the emission from laterally coupled quantum dots is strongly polarized along the coupled direction [1 1¯ 0], and its polarization anisotropy can be shaped by changing the orientation of the polarized excitation. When the nonresonant excitation is linearly polarized perpendicular to the coupled direction [110], excitons (X1 and X2) and local biexcitons (X1X1 and X2X2) from the two separate quantum dots (QD1 and QD2) show emission anisotropy with a small degree of polarization (10%). On the other hand, when the excitation polarization is parallel to the coupled direction [1 1¯ 0], the polarization anisotropy of excitons, local biexcitons, and coupled biexcitons (X1X2) is enhanced with a degree of polarization of 74%. We also observed a consistent anisotropy in the time-resolved photoluminescence. The decay rate of the polarized photoluminescence intensity along the coupled direction is relatively high, but the anisotropic decay rate can be modified by changing the orientation of the polarized excitation. An energy difference is also observed between the polarized emission spectra parallel and perpendicular to the coupled direction, and it increases by up to three times by changing the excitation polarization orientation from [110] to [1 1¯ 0]. These results suggest that the dipole-dipole interaction across the two separate quantum dots is mediated and that the anisotropic wavefunctions of the excitons and biexcitons are shaped by the excitation polarization.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, 1.7MB, Terms of use)
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- Publisher copy:
- 10.1038/s41377-020-0339-3
Authors
- Publisher:
- Springer Nature
- Journal:
- Light: Science and Applications More from this journal
- Volume:
- 9
- Issue:
- 1
- Article number:
- 100
- Place of publication:
- England
- Publication date:
- 2020-06-11
- Acceptance date:
- 2020-06-01
- DOI:
- EISSN:
-
2047-7538
- ISSN:
-
2095-5545
- Pmid:
-
32566170
- Language:
-
English
- Keywords:
- Pubs id:
-
1113290
- Local pid:
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pubs:1113290
- Deposit date:
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2020-07-15
Terms of use
- Copyright holder:
- Kim et al.
- Copyright date:
- 2020
- Rights statement:
- © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
- Licence:
- CC Attribution (CC BY)
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