中国物理B ›› 2018, Vol. 27 ›› Issue (12): 127301-127301.doi: 10.1088/1674-1056/27/12/127301

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇    下一篇

Tunable edge bands and optical properties in black phosphorus nanoribbons under electric field

Hong Liu(刘红)   

  1. Physics Department, Nanjing Normal University, Nanjing 210023, China
  • 收稿日期:2018-08-03 修回日期:2018-11-04 出版日期:2018-12-05 发布日期:2018-12-05
  • 通讯作者: Hong Liu E-mail:liuhong3@njnu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 10947004) and the Jiangsu Government Scholarship for Overseas Studies.

Tunable edge bands and optical properties in black phosphorus nanoribbons under electric field

Hong Liu(刘红)   

  1. Physics Department, Nanjing Normal University, Nanjing 210023, China
  • Received:2018-08-03 Revised:2018-11-04 Online:2018-12-05 Published:2018-12-05
  • Contact: Hong Liu E-mail:liuhong3@njnu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 10947004) and the Jiangsu Government Scholarship for Overseas Studies.

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摘要：

For several types of the applied electric field configuration on the normal-zigzag black phosphorus nanoribbon (nZZ-BPNR) we investigate the band structure and the linear optical absorption spectrum, especially for the edge states and the corresponding low-energy absorption peaks. The obtained results show that the applied electric field can not only open another band gap at k=0.5 point, but also can change completely the spacial probabilities of edge states in the two edge bands. The strength of electric field can tune the two band gaps at the Γ point and 0.5 point. Further, one remarkable feature is that the forbidden transition E12 and E21 are allowed. The lowest-excited-energy linear absorption peak E11 originates from the transition between two edge bands at the Γ point. Finally, in comparison with the lowest-excited-energy peaks among various configurations, the second type of electric field configuration can move this peak blue-shift larger than other configurations.

关键词: black phosphorus nanoribbon, edge band, linear optical absorption spectrum

Abstract:

For several types of the applied electric field configuration on the normal-zigzag black phosphorus nanoribbon (nZZ-BPNR) we investigate the band structure and the linear optical absorption spectrum, especially for the edge states and the corresponding low-energy absorption peaks. The obtained results show that the applied electric field can not only open another band gap at k=0.5 point, but also can change completely the spacial probabilities of edge states in the two edge bands. The strength of electric field can tune the two band gaps at the Γ point and 0.5 point. Further, one remarkable feature is that the forbidden transition E12 and E21 are allowed. The lowest-excited-energy linear absorption peak E11 originates from the transition between two edge bands at the Γ point. Finally, in comparison with the lowest-excited-energy peaks among various configurations, the second type of electric field configuration can move this peak blue-shift larger than other configurations.

Key words: black phosphorus nanoribbon, edge band, linear optical absorption spectrum

中图分类号:  (Surface states, band structure, electron density of states)

  • 73.20.At
78.90.+t (Other topics in optical properties, condensed matter spectroscopy and other interactions of particles and radiation with condensed matter)