{"title":"界面工程控制耦合II-VI量子点的量子受限Stark效应。","authors":"Pingping Han, Tingli Du, Si Zhou, Jijun Zhao","doi":"10.1002/smtd.202402262","DOIUrl":null,"url":null,"abstract":"<p><p>Electric-field tuning of excitonic states in confined systems via the quantum-confined Stark effect (QCSE) provides a flexible way for electro-optic modulation with great efficiency. In epitaxial and colloidal quantum dots (QDs), the interdot coupling allows additional degrees of freedom for optical switches. Here QCSE is explored in artificial molecules formed by two coupled QDs of main group II-VI elements. Compared with a single QD, the QCSE is remarkably enhanced in QD molecules and highly tunable by the interdot coupling strength as well as by homo- and hetero-dimerization of QDs. In addition, the strong coupling between QDs can retard charge separation under an external electric field and even bring the electron and hole states from two QDs into a resonance, thereby boosting the fluorescence emission in QD molecules. These mechanistic understandings provide vital guidelines for fine manipulation of electron, spin, and exciton in coupled QDs and their assemblies for tunable optoelectronics, photonics, and quantum information applications.</p>","PeriodicalId":229,"journal":{"name":"Small Methods","volume":" ","pages":"e2402262"},"PeriodicalIF":10.7000,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Controlling Quantum-Confined Stark Effect in Coupled II-VI Quantum Dots by Interface Engineering.\",\"authors\":\"Pingping Han, Tingli Du, Si Zhou, Jijun Zhao\",\"doi\":\"10.1002/smtd.202402262\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Electric-field tuning of excitonic states in confined systems via the quantum-confined Stark effect (QCSE) provides a flexible way for electro-optic modulation with great efficiency. In epitaxial and colloidal quantum dots (QDs), the interdot coupling allows additional degrees of freedom for optical switches. Here QCSE is explored in artificial molecules formed by two coupled QDs of main group II-VI elements. Compared with a single QD, the QCSE is remarkably enhanced in QD molecules and highly tunable by the interdot coupling strength as well as by homo- and hetero-dimerization of QDs. In addition, the strong coupling between QDs can retard charge separation under an external electric field and even bring the electron and hole states from two QDs into a resonance, thereby boosting the fluorescence emission in QD molecules. These mechanistic understandings provide vital guidelines for fine manipulation of electron, spin, and exciton in coupled QDs and their assemblies for tunable optoelectronics, photonics, and quantum information applications.</p>\",\"PeriodicalId\":229,\"journal\":{\"name\":\"Small Methods\",\"volume\":\" \",\"pages\":\"e2402262\"},\"PeriodicalIF\":10.7000,\"publicationDate\":\"2025-05-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Small Methods\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1002/smtd.202402262\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Small Methods","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1002/smtd.202402262","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Controlling Quantum-Confined Stark Effect in Coupled II-VI Quantum Dots by Interface Engineering.
Electric-field tuning of excitonic states in confined systems via the quantum-confined Stark effect (QCSE) provides a flexible way for electro-optic modulation with great efficiency. In epitaxial and colloidal quantum dots (QDs), the interdot coupling allows additional degrees of freedom for optical switches. Here QCSE is explored in artificial molecules formed by two coupled QDs of main group II-VI elements. Compared with a single QD, the QCSE is remarkably enhanced in QD molecules and highly tunable by the interdot coupling strength as well as by homo- and hetero-dimerization of QDs. In addition, the strong coupling between QDs can retard charge separation under an external electric field and even bring the electron and hole states from two QDs into a resonance, thereby boosting the fluorescence emission in QD molecules. These mechanistic understandings provide vital guidelines for fine manipulation of electron, spin, and exciton in coupled QDs and their assemblies for tunable optoelectronics, photonics, and quantum information applications.
Small MethodsMaterials Science-General Materials Science
CiteScore
17.40
自引率
1.60%
发文量
347
期刊介绍：
Small Methods is a multidisciplinary journal that publishes groundbreaking research on methods relevant to nano- and microscale research. It welcomes contributions from the fields of materials science, biomedical science, chemistry, and physics, showcasing the latest advancements in experimental techniques.
With a notable 2022 Impact Factor of 12.4 (Journal Citation Reports, Clarivate Analytics, 2023), Small Methods is recognized for its significant impact on the scientific community.
The online ISSN for Small Methods is 2366-9608.
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