Recently, Jiang Peng, Research Fellow, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Bao Xinhe, Academician of the Chinese Academy of Sciences, and Zhou Junyao, Associate Research Fellow, Yang Xueming, Academician of the Chinese Academy of Sciences Academician, and Cao Yi, Professor of Dalian University of Technology, have achieved new results in plasmon resonance study of nano thermoelectric materials. Progress, related results were published in the Nano Letters.
Bi2Te3 is one of the most widely studied thermoelectric materials. Because of its unique three-dimensional topological insulator properties, Bi2Te3 has been a research hotspot in the fields of material physics and condensed matter physics in recent years. In this work, researchers used the 400nm femtosecond laser excited light emission electron microscope (PEEM, Shanghai Synchrotron Radiation Source Dream Line, BL09U1) to study the plasmonic properties of Bi2Te3 nanosheets. Observed from the experimental wavelength in the visible light The range of boundary plasmons, further research shows that the plasmon is mainly derived from the non-equilibrium carriers induced by the inter-band transitions. This work breaks through the limitations of traditional visible light range plasmon systems, which are usually noble metal materials such as gold and silver, and provides important experimental evidence for the understanding of plasmon formed by non-equilibrium carriers in semiconductor materials. Further research on the novel physical effects of nano-thermoelectric materials and topological insulator materials under multi-field regulation provides a new idea.
The work was funded by the National Natural Science Foundation of China, the National Key Research Program for Nanotechnology, and the Chinese Academy of Sciences Youth Innovation Promotion Association.
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