| SPECIAL TOPIC—60th Anniversary of Department of Physics of Nanjing Normal University |
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Tunable edge bands and optical properties in black phosphorus nanoribbons under electric field |
| Hong Liu(刘红) |
| Physics Department, Nanjing Normal University, Nanjing 210023, China |
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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.
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Received: 03 August 2018
Revised: 04 November 2018
Accepted manuscript online:
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PACS:
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73.20.At
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(Surface states, band structure, electron density of states)
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78.90.+t
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(Other topics in optical properties, condensed matter spectroscopy and other interactions of particles and radiation with condensed matter)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10947004) and the Jiangsu Government Scholarship for Overseas Studies. |
Corresponding Authors:
Hong Liu
E-mail: liuhong3@njnu.edu.cn
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Cite this article:
Hong Liu(刘红) Tunable edge bands and optical properties in black phosphorus nanoribbons under electric field 2018 Chin. Phys. B 27 127301
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