China University of Science and Technology has made progress in the study of surface energy valleys and spin electronic states
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Recently, Professor Wang Bing of the University of Science and Technology of China has made new progress in the study of surface energy valleys and spintronic states of the Bi ultra-thin film. His research results were published on Nature Communications on March 11th. Du Hongjian and Associate Professor Sun Xia are the co-first authors of the thesis.
A two-dimensional material with a honeycomb hexagonal lattice usually has a degenerate extremum, namely valleys, in its momentum band and its energy band near the valence band edge. The Bi(111) surface structure is a honeycomb-like hexagonal lattice, and thus its surface electronic state has the energy band structure of a vortex-like spin-state pluripotent valley. The research team used a low-temperature (4.2K) strong magnetic field (11T) scanning tunneling microscope (STM) to obtain the quantized differential conductance spectra of Bi(111) ultrathin films at different magnetic fields, and to use analogy to conventional magnetic oscillation experiments. The analytical method accurately measures the quantized Landau energy level and distinguishes the electron states from the surface electrons and the hole energy valleys. At the same time, it was also observed that a group of Van-Whoff singular surface states with large g-factors (~33) in the energy band structure split due to strong magnetic fields, and spin-polarized energy-valley states can thus be obtained. . This work shows that these properties of the Bi(111) ultrathin film make it possible to apply it to the construction of spin and energy devices.
The research was funded by the National Natural Science Foundation of China, the Chinese Academy of Sciences, the Ministry of Science and Technology, and the Ministry of Education.
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