中国物理B ›› 2018, Vol. 27 ›› Issue (9): 97304-097304.doi: 10.1088/1674-1056/27/9/097304

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Electric field manipulation of multiple nonequivalent Dirac cones in the electronic structures of hexagonal CrB4 sheet

Jinkun Wang(王锦坤), Yajiao Ke(柯亚娇), Qingxing Xie(谢晴兴), Yanli Li(李艳丽), Jiafu Wang(王嘉赋)   

  1. 1 Department of Physics and Institute of Applied Condensed Matter Physics, School of Science, Wuhan University of Technology, Wuhan 430070, China;
    2 Hubei Engineering Research Center of RF-Microwave Technology and Application, Wuhan University of Technology, Wuhan 430070, China
  • 收稿日期:2018-07-20 修回日期:2018-08-20 出版日期:2018-09-05 发布日期:2018-09-05
  • 通讯作者: Yajiao Ke, Jiafu Wang E-mail:keyajiao@whut.edu.cn;jasper@whut.edu.cn
  • 基金资助:

    Project supported by the National Natural Sciences Foundation of China (Grant Nos. 11704294 and 11504281), the Natural Science Foundation of Hubei Province, China (Grant No. 2016CFB586), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. 2017IVA078, 2018IVB017, 2017IB013, 2018IB009, and 2018IB011).

Electric field manipulation of multiple nonequivalent Dirac cones in the electronic structures of hexagonal CrB4 sheet

Jinkun Wang(王锦坤)1, Yajiao Ke(柯亚娇)1, Qingxing Xie(谢晴兴)1, Yanli Li(李艳丽)1, Jiafu Wang(王嘉赋)1,2   

  1. 1 Department of Physics and Institute of Applied Condensed Matter Physics, School of Science, Wuhan University of Technology, Wuhan 430070, China;
    2 Hubei Engineering Research Center of RF-Microwave Technology and Application, Wuhan University of Technology, Wuhan 430070, China
  • Received:2018-07-20 Revised:2018-08-20 Online:2018-09-05 Published:2018-09-05
  • Contact: Yajiao Ke, Jiafu Wang E-mail:keyajiao@whut.edu.cn;jasper@whut.edu.cn
  • Supported by:

    Project supported by the National Natural Sciences Foundation of China (Grant Nos. 11704294 and 11504281), the Natural Science Foundation of Hubei Province, China (Grant No. 2016CFB586), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. 2017IVA078, 2018IVB017, 2017IB013, 2018IB009, and 2018IB011).

摘要:

Two-dimensional materials with Dirac cones have significant applications in photoelectric technology. The origin and manipulation of multiple Dirac cones need to be better understood. By first-principle calculations, we study the influence of external fields on the electronic structure of the hexagonal CrB4 sheet with double nonequivalent Dirac cones. Our results show that the two cones are not sensitive to tensile strain and out-of-plane electric field, but present obviously different behaviors under the in-plane external electric field (along the B-B direction), i.e., one cone holds while the other vanishes with a gap opening. More interestingly, a new nonequivalent cone emerges under a proper in-plane electric field. We also discuss the origin of the cones in CrB4 sheet. Our study provides a new method on how to obtain Dirac cones by the external field manipulation, which may motivate potential applications in nanoelectronics.

关键词: borophene, multiple Dirac cones, electric field manipulation, first-principle calculation

Abstract:

Two-dimensional materials with Dirac cones have significant applications in photoelectric technology. The origin and manipulation of multiple Dirac cones need to be better understood. By first-principle calculations, we study the influence of external fields on the electronic structure of the hexagonal CrB4 sheet with double nonequivalent Dirac cones. Our results show that the two cones are not sensitive to tensile strain and out-of-plane electric field, but present obviously different behaviors under the in-plane external electric field (along the B-B direction), i.e., one cone holds while the other vanishes with a gap opening. More interestingly, a new nonequivalent cone emerges under a proper in-plane electric field. We also discuss the origin of the cones in CrB4 sheet. Our study provides a new method on how to obtain Dirac cones by the external field manipulation, which may motivate potential applications in nanoelectronics.

Key words: borophene, multiple Dirac cones, electric field manipulation, first-principle calculation

中图分类号:  (Electronic structure of nanoscale materials and related systems)

  • 73.22.-f
71.20.Ps (Other inorganic compounds)