SEU scored new progress in research on topological Kondo system
Editor's note
Recently, new advances were made by Prof. Miao Lin from School of Physics of SEU in the study of the electronic structure evolution of SmB6 in topological Kondo system, with relevant results published in Phys. Rev. Lett., a world-renowned journal of physics.
SmB6 is regarded as a topological Kondo insulator, whose insulation band gap is formed by hybridizing the d-orbital energy band with the coherent f-orbital electron obtained at low temperature. Therefore, SmB6 is a relatively rare topologically-associated system that features both the associative effect and the nontrivial topological phase. When doping the system with excessive rare earth magnetism to introduce magnetism, the f-orbital coherence of the system was maintained, without affecting the topological surface states of the system. What's more, when the concentration of the magnetic element europium (Eu) was higher than 10%, the topological Kondo phase with antiferromagnetic order was produced. This is the first discovery of a system with magnetic order, topological order and Kondo association. Besides, after analyzing the evolution of the electronic structure of the system under thermal agitation, it is found that the topological surface states of the system are directly produced with the formation of the direct band gap, demonstrating the robustness of the topological order of the system.
The results, titled "Robust Surface States and Coherence Phenomena in Magnetically AlloyedSmB6", were published in Phys. Rev. Lett. on March 31. Prof. Miao Lin is the first author and Prof. L. Andrew Wray from New York University is the corresponding author. In addition, researchers from Advanced Light Source of Lawrence Berkeley National Laboratory, National Synchrotron Light Source II of Brookhaven National Laboratory, University of Würzburg and Gwangju Institute of Science and Technology (GIST) have also participated in this research.
This research was funded by National Natural Science Foundation of China and Natural Science Foundation of Jiangsu Province.
#Paper's link
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.126.136401
Submitted by School of Physics
Edited by Wu Hanyu
Reviewed by Li Xiaonan
Revised by Shu Yuan
Proofread by Melody Zhang
Edited by Luo Xinyi
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