The No. 5 water-cooled magnet of the strong magnetic field experimental apparatus of the Strong Magnetic Field Science Center of the Hefei Research Institute of Materials Science, Chinese Academy of Sciences, was used to perform precise data measurements at a magnetic field strength of 30 Tesla and a low temperature of 0.36K. The electronic structure of the potential topological superconducting material PdTe2 was studied and a perfect strong magnetic field oscillation signal was obtained. This work gives the dominant single-band electronic structure in this system from both magnetic and electrical properties. This result is of great significance to the later research on the electronic state structure of topological superconducting materials. The research results are based on De Hass-van Alphen and magnetoresistance reveal predominantly single-band transport behavior in PdTe2 and were published in the Scientific Reports (Scientific Reports, 6, 31554 (2016)) published on August 12.
Topological superconducting materials have become a hot topic in the field of condensed matter physics and material physics because of their great prospects in basic physical research and industrial applications. In the past few years, potential topological superconducting materials such as CuxBi2Se3 and SrxBi2Se3 have been found in doped topological insulators, which has caused widespread concern. However, there is no complete understanding of the electronic state of topological superconducting materials.
Previous theoretical calculations and experimental results of angle-resolved photoelectron spectroscopy have shown that PdTe2 material has a complex multi-band electronic structure, which greatly limits the further study of this system. Zhang Changjin's group observed a very clear and periodic de Hass-van Alphen oscillation signal through magnetic measurements under a strong magnetic field. The Fourier transform analysis of the oscillation signal revealed that there was a dominant oscillation peak in the system. Compared with this oscillation peak, the amplitudes of other oscillation peaks (representing different energy bands) are at least one order of magnitude or more lower. This shows that the electronic structure of the system can be completely reduced to a single-band structure. The research group also used a resistivity test under a strong magnetic field to obtain evidence of single-band behavior from the magnetoresistance behavior.
The work was funded by the Ministry of Science and Technology, the National Natural Science Foundation of China and the Hefei University Science Center.
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