| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Discrete vortex bound states with a van Hove singularity in the vicinity of the Fermi level |
| Delong Fang(方德龙)† and Yunkang Cui(崔云康) |
| School of Mathematics and Physics, Nanjing Institute of Technology, Nanjing 211167, China |
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Abstract A theoretical study on discrete vortex bound states is carried out near a vortex core in the presence of a van Hove singularity (VHS) near the Fermi level by solving Bogoliubov-de Gennes (BdG) equations. When the VHS lies exactly at the Fermi level and also at the middle of the band, a zero-energy state and other higher-energy states whose energy ratios follow integer numbers emerge. These discrete vortex bound state peaks undergo a splitting behavior when the VHS or Fermi level moves away from the middle of the band. Such splitting behavior will eventually lead to a new arrangement of quantized vortex core states whose energy ratios follow half-odd-integer numbers.
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Received: 13 September 2022
Revised: 09 November 2022
Accepted manuscript online: 29 November 2022
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PACS:
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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74.25.Ha
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(Magnetic properties including vortex structures and related phenomena)
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74.25.Op
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(Mixed states, critical fields, and surface sheaths)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11804154), and the Scientific Research Foundation of NJIT (Grant Nos. YKJ201853 and CKJA201807). |
Corresponding Authors:
Delong Fang
E-mail: fangdel@njit.edu.cn
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Cite this article:
Delong Fang(方德龙) and Yunkang Cui(崔云康) Discrete vortex bound states with a van Hove singularity in the vicinity of the Fermi level 2023 Chin. Phys. B 32 057401
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