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Magnetic polaron-related optical properties in Ni(II)-doped CdS nanobelts: Implication for spin nanophotonic devices |
| Fu-Jian Ge(葛付建)1, Hui Peng(彭辉)1, Ye Tian(田野)1, Xiao-Yue Fan(范晓跃)1, Shuai Zhang(张帅)2,3, Xian-Xin Wu(吴宪欣)2,3, Xin-Feng Liu(刘新风)2,3,†, and Bing-Suo Zou(邹炳锁)4,‡ |
1 Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China;
2 CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China;
3 University of Chinese Academy of Sciences(CAS), Beijing 100049, China;
4 Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environments and Materials, Guangxi University, Nanning 530004, China |
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Abstract Emissions by magnetic polarons and spin-coupled d-d transitions in diluted magnetic semiconductors (DMSs) have become a popular research field due to their unusual optical behaviors. In this work, high-quality NiI2(II)-doped CdS nanobelts are synthesized via chemical vapor deposition (CVD), and then characterized by scanning electron microscopy (SEM), x-ray diffraction, x-ray photoelectron spectroscopy (XPS), and Raman scattering. At low temperatures, the photoluminescence (PL) spectra of the Ni-doped nanobelts demonstrate three peaks near the band edge: the free exciton (FX) peak, the exciton magnetic polaron (EMP) peak out of ferromagnetically coupled spins coupled with FXs, and a small higher-energy peak from the interaction of antiferromagnetic coupled Ni pairs and FXs, called antiferromagnetic magnetic polarons (AMPs). With a higher Ni doping concentration, in addition to the d-d transitions of single Ni ions at 620 nm and 760 nm, two other PL peaks appear at 530 nm and 685 nm, attributed to another EMP emission and the d-d transitions of the antiferromagnetic coupled Ni2+-Ni2+ pair, respectively. Furthermore, single-mode lasing at the first EMP is excited by a femtosecond laser pulse, proving a coherent bosonic lasing of the EMP condensate out of complicated states. These results show that the coupled spins play an important role in forming magnetic polaron and implementing related optical responses.
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Received: 30 March 2021
Revised: 18 May 2021
Accepted manuscript online: 03 June 2021
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PACS:
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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75.75.-c
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(Magnetic properties of nanostructures)
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78.55.Et
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(II-VI semiconductors)
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71.35.Ji
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(Excitons in magnetic fields; magnetoexcitons)
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| Fund: Project supported by the National Key Basic Research Project of China (Grant No. 2014CB920903), the Guangxi NSF Key Fund, China (Grant No. 2020GXNSFDA238004), the Fund from the Ministry of Science and Technology, China (Grant No. 2017YFA0205004), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB36000000), the National Natural Science Foundation of China (Grant Nos. 11874130, 22073022, 20173025, and 12074086), the DNL Cooperation Fund of the Chinese Academy of Sciences (Grant No. DNL202016), and the CAS Instrument Development Project (Grant No. Y950291). |
Corresponding Authors:
Xin-Feng Liu, Bing-Suo Zou
E-mail: liuxf@nanoctr.cn;zoubs@bit.edu.cn
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Cite this article:
Fu-Jian Ge(葛付建), Hui Peng(彭辉), Ye Tian(田野), Xiao-Yue Fan(范晓跃), Shuai Zhang(张帅), Xian-Xin Wu(吴宪欣), Xin-Feng Liu(刘新风), and Bing-Suo Zou(邹炳锁) Magnetic polaron-related optical properties in Ni(II)-doped CdS nanobelts: Implication for spin nanophotonic devices 2022 Chin. Phys. B 31 017802
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