Magnetic polaron-related optical properties in Ni(Ⅱ)-doped Cd S nanobelts: Implication for spin nanophotonic devices  

作　　者：Fu-Jian Ge Hui Peng Ye Tian Xiao-Yue Fan Shuai Zhang Xian-Xin Wu Xin-Feng Liu Bing-Suo Zou 葛付建;彭辉;田野;范晓跃;张帅;吴宪欣;刘新风;邹炳锁(Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems,School of Physics,Beijing Institute of Technology,Beijing 100081,China;CAS Key Laboratory of Standardization and Measurement for Nanotechnology,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,Beijing 100190,China;University of Chinese Academy of Sciences(CAS),Beijing 100049,China;Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials,School of Resources,Environments and Materials,Guangxi University,Nanning 530004,China)

机构地区：[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

出　　处：《Chinese Physics B》2022年第1期590-597,共8页中国物理B（英文版）

基　　金：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);the CAS Instrument Development Project(Grant No.Y950291).

摘　　要：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 NiI_(2)(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 Ni^(2+)-Ni^(2+)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.

关 键 词：dilute magnetic semiconductor exciton magnetic polaron photoluminescence antiferromagnetic magnetic polaron 

分 类 号：O469[理学—凝聚态物理]