| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Time-dependent first-principles study of optical response of BaTiO3 quantum dots coupled with silver nanowires |
| Bo-Xun Han(韩博逊)1, Hong Zhang(张红)1,2 |
1 College of Physical Science and Technology, Sichuan University, Chengdu 610065, China;
2 Key Laboratory of High Energy Density Physics and Technology(Ministry of Education), Sichuan University, Chengdu 610065, China |
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Abstract All-inorganic perovskite quantum dots (QDs) have drawn much attention due to their prominent quantum-size effects and highly tunable optical properties. Tuning the size of perovskite QDs is attractive for many potential applications. For instance, smaller QDs exhibit more evident quantum properties than larger QDs, but present a blue-shifted spectrum, which limits their applications. Here, we conduct a systematically theoretical analysis about the optical response and plasmon resonance of comparatively small barium titanate quantum dots (BTO-QDs) coupled with silver (Ag) nanowires based on time-dependent density functional theory (TDDFT). Our results show that the silver nanowires can induce an intense optical response respectively in the infrared and visible region to eliminate the spectrum-shift. Furthermore, the absorption spectrum and plasmon resonance can be effectively modified by either altering the position of the silver nanowires or changing the thickness of the BTO-QDs. More importantly, these two methods can act simultaneously, this maybe provide a new approach to implementing the quantum control.
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Received: 14 January 2019
Revised: 29 March 2019
Accepted manuscript online:
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PACS:
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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73.21.-b
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(Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems)
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| Fund: Project support by the National Key Research and Development Program of China (Grant No. 2017YFA0303600) and the National Natural Science Foundation of China (Grant No. 11474207). |
Corresponding Authors:
Hong Zhang
E-mail: hongzhang@scu.edu.cn
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Cite this article:
Bo-Xun Han(韩博逊), Hong Zhang(张红) Time-dependent first-principles study of optical response of BaTiO3 quantum dots coupled with silver nanowires 2019 Chin. Phys. B 28 067301
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