Recently, Jiang Peng, Research Fellow, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Bao Xinhe, Academician of the Chinese Academy of Sciences, Zhou Chuanyao, Associate Research Fellow, Yang Xueming, Academician of the Chinese Academy of Sciences, and Cao Ying, Professor of Dalian University of Technology, obtained new insights in plasmon resonance of nano thermoelectric materials. Progress, related results were published in Nano Letters.
Bi2Te3 is one of the most widely studied thermoelectric materials. Due to 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 400 nm femtosecond laser to stimulate light emission. Electron Microscope (PEEM, Shanghai Synchrotron Radiation Source Dream Line, BL09U1) studied the plasmonic properties of Bi2Te3 nanosheets, and experimentally observed the boundary plasmons with wavelengths in the visible range. Further studies showed that these isoelectric excitons The element is mainly derived from the non-equilibrium carriers induced by the inter-band transitions. This work breaks through the limitations of the traditional visible light range plasmon system, which is usually a noble metal material such as gold and silver, in order to understand the non-equilibrium current carrying in the semiconductor material. The plasmon-formed plasmons provided important experimental evidence, and provided new ideas for further studying the novel physical effects of nano-thermoelectric materials and topological insulator materials under multi-field regulation.
This 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.
