Distinct edge states and optical conductivities in the zigzag and armchair silicene nanoribbons under exchange and electric fields

doi:10.1088/1674-1056/27/3/037301

中国物理B ›› 2018, Vol. 27 ›› Issue (3): 37301-037301.doi: 10.1088/1674-1056/27/3/037301

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

Distinct edge states and optical conductivities in the zigzag and armchair silicene nanoribbons under exchange and electric fields

Jianfei Zou(邹剑飞), Jing Kang(康静)

College of Science, Hohai University, Nanjing 210098, China

收稿日期:2017-09-12 修回日期:2017-12-22 出版日期:2018-03-05 发布日期:2018-03-05
通讯作者: Jianfei Zou E-mail:zoujianfei@hhu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11347127, 61404044, and 11347111).

Distinct edge states and optical conductivities in the zigzag and armchair silicene nanoribbons under exchange and electric fields

Jianfei Zou(邹剑飞), Jing Kang(康静)

College of Science, Hohai University, Nanjing 210098, China

Received:2017-09-12 Revised:2017-12-22 Online:2018-03-05 Published:2018-03-05
Contact: Jianfei Zou E-mail:zoujianfei@hhu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11347127, 61404044, and 11347111).

摘要/Abstract

摘要： Based on the tight binding model, we investigate the low energy bandstructures, edge states, and optical absorptions for the silicene nanoribbons (SiNRs) with different terminations under an in-plane exchange field and/or a perpendicular electric field. We find that the zigzag SiNRs are gapped by the exchange field, but they could reenter the metallic state after the application of the electric field. Contrarily, a certain kind of armchair SiNRs remain gapless even if a weak exchange field is present. Furthermore, the combination of the exchange and electric fields could effectively modulate the penetration length and the components of the edge states in the SiNRs. The corresponding optical conductivities for the SiNRs are also calculated, which show remarkable dependence on the edge types of the SiNRs and the two external fields.

关键词: silicene nanoribbon, edge state, optical conductivity, exchange field

Abstract: Based on the tight binding model, we investigate the low energy bandstructures, edge states, and optical absorptions for the silicene nanoribbons (SiNRs) with different terminations under an in-plane exchange field and/or a perpendicular electric field. We find that the zigzag SiNRs are gapped by the exchange field, but they could reenter the metallic state after the application of the electric field. Contrarily, a certain kind of armchair SiNRs remain gapless even if a weak exchange field is present. Furthermore, the combination of the exchange and electric fields could effectively modulate the penetration length and the components of the edge states in the SiNRs. The corresponding optical conductivities for the SiNRs are also calculated, which show remarkable dependence on the edge types of the SiNRs and the two external fields.

Key words: silicene nanoribbon, edge state, optical conductivity, exchange field

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

73.20.At

78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures) 81.05.ue (Graphene)

邹剑飞, 康静. Distinct edge states and optical conductivities in the zigzag and armchair silicene nanoribbons under exchange and electric fields[J]. 中国物理B, 2018, 27(3): 37301-037301.

Jianfei Zou(邹剑飞), Jing Kang(康静). Distinct edge states and optical conductivities in the zigzag and armchair silicene nanoribbons under exchange and electric fields[J]. Chin. Phys. B, 2018, 27(3): 37301-037301.

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Distinct edge states and optical conductivities in the zigzag and armchair silicene nanoribbons under exchange and electric fields

Distinct edge states and optical conductivities in the zigzag and armchair silicene nanoribbons under exchange and electric fields

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