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

• 来源期刊: 中国物理B（英文版）
• 关键词: black phosphorus nanoribbon edge band linear optical absorption spectrum
• 年，卷（期）: 2018,（12）
• 页码范围: 130-136
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/12/127301

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 theΓ 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 theΓ 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.