中国物理B ›› 2022, Vol. 31 ›› Issue (1): 17403-017403.doi: 10.1088/1674-1056/ac40fa

所属专题: SPECIAL TOPIC — Unconventional superconductivity

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Superconductivity in octagraphene

Jun Li(李军)1,2 and Dao-Xin Yao(姚道新)1,†   

  1. 1 State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China;
    2 Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
  • 收稿日期:2021-09-17 修回日期:2021-12-02 接受日期:2021-12-08 出版日期:2021-12-03 发布日期:2021-12-30
  • 通讯作者: Dao-Xin Yao E-mail:yaodaox@mail.sysu.edu.cn
  • 基金资助:
    This project is supported by the National Key R&D Program of China (Grant Nos. 2017YFA0206203 and 2018YFA0306001), the National Natural Science Foundation of China (Grant No. 11974432), GBABRF-2019A1515011337, Natural Science Foundation of Hebei Province, China (Grant No. A2021203010), Shenzhen Institute for Quantum Science and Engineering (Grant No. SIQSE202102), and Leading Talent Program of Guangdong Special Projects.

Superconductivity in octagraphene

Jun Li(李军)1,2 and Dao-Xin Yao(姚道新)1,†   

  1. 1 State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China;
    2 Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
  • Received:2021-09-17 Revised:2021-12-02 Accepted:2021-12-08 Online:2021-12-03 Published:2021-12-30
  • Contact: Dao-Xin Yao E-mail:yaodaox@mail.sysu.edu.cn
  • Supported by:
    This project is supported by the National Key R&D Program of China (Grant Nos. 2017YFA0206203 and 2018YFA0306001), the National Natural Science Foundation of China (Grant No. 11974432), GBABRF-2019A1515011337, Natural Science Foundation of Hebei Province, China (Grant No. A2021203010), Shenzhen Institute for Quantum Science and Engineering (Grant No. SIQSE202102), and Leading Talent Program of Guangdong Special Projects.

摘要: This article reviews the basic theoretical aspects of octagraphene, an one-atom-thick allotrope of carbon, with unusual two-dimensional (2D) Fermi nesting, hoping to contribute to the new family of quantum materials. Octagraphene has an almost strongest sp2 hybrid bond similar to graphene, and has the similar electronic band structure as iron-based superconductors, which makes it possible to realize high-temperature superconductivity. We have compared various possible mechanisms of superconductivity, including the unconventional s± superconductivity driven by spin fluctuation and conventional superconductivity based on electron-phonon coupling. Theoretical studies have shown that octagraphene has relatively high structural stability. Although many 2D carbon materials with C4 carbon ring and C8 carbon ring structures have been reported, it is still challenging to realize the octagraphene with pure square-octagon structure experimentally. This material holds hope to realize new 2D high-temperature superconductivity.

关键词: octagraphene, s± superconductivity, square-octagon lattice, Fermi surface nesting

Abstract: This article reviews the basic theoretical aspects of octagraphene, an one-atom-thick allotrope of carbon, with unusual two-dimensional (2D) Fermi nesting, hoping to contribute to the new family of quantum materials. Octagraphene has an almost strongest sp2 hybrid bond similar to graphene, and has the similar electronic band structure as iron-based superconductors, which makes it possible to realize high-temperature superconductivity. We have compared various possible mechanisms of superconductivity, including the unconventional s± superconductivity driven by spin fluctuation and conventional superconductivity based on electron-phonon coupling. Theoretical studies have shown that octagraphene has relatively high structural stability. Although many 2D carbon materials with C4 carbon ring and C8 carbon ring structures have been reported, it is still challenging to realize the octagraphene with pure square-octagon structure experimentally. This material holds hope to realize new 2D high-temperature superconductivity.

Key words: octagraphene, s± superconductivity, square-octagon lattice, Fermi surface nesting

中图分类号:  (Theories and models of superconducting state)

  • 74.20.-z
74.20.Pq (Electronic structure calculations) 74.70.Kn (Organic superconductors) 02.60.-x (Numerical approximation and analysis)