中国物理B ›› 2016, Vol. 25 ›› Issue (9): 97303-097303.doi: 10.1088/1674-1056/25/9/097303

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

Charge susceptibilities of armchair graphene nanoribbon in the presence of magnetic field

H Rezania, F Azizi   

  1. Department of Physics, Razi University, Kermanshah, Iran
  • 收稿日期:2015-12-28 修回日期:2016-04-22 出版日期:2016-09-05 发布日期:2016-09-05
  • 通讯作者: H Rezania, E-mail:rezania.hamed@gmail.com

Charge susceptibilities of armchair graphene nanoribbon in the presence of magnetic field

H Rezania, F Azizi   

  1. Department of Physics, Razi University, Kermanshah, Iran
  • Received:2015-12-28 Revised:2016-04-22 Online:2016-09-05 Published:2016-09-05
  • Contact: H Rezania, E-mail:rezania.hamed@gmail.com

摘要: We present the behaviors of both dynamical and static charge susceptibilities of undoped armchair graphene nanoribbon using the Green's function approach in the context of tight binding model Hamiltonian. Specifically, the effects of magnetic field on the the plasmon modes of armchair graphene nanoribbon are investigated via calculating the correlation function of charge density operators. Our results show that the increase of magnetic field makes the high-frequency plasmon mode for both metallic and insulating cases disappear. We also show that low-frequency plasmon mode for metallic nanoribbon appears due to increase of magnetic field. Furthermore, the number of collective excitation modes increases with ribbon width at zero magnetic field. Finally, the temperature dependence of the static charge structure factor of armchair graphene nanoribbon is studied. The effects of both magnetic field and ribbon width on the static charge structure factor are discussed in detail.

关键词: armchair graphene nanoribbon, Green', s function

Abstract: We present the behaviors of both dynamical and static charge susceptibilities of undoped armchair graphene nanoribbon using the Green's function approach in the context of tight binding model Hamiltonian. Specifically, the effects of magnetic field on the the plasmon modes of armchair graphene nanoribbon are investigated via calculating the correlation function of charge density operators. Our results show that the increase of magnetic field makes the high-frequency plasmon mode for both metallic and insulating cases disappear. We also show that low-frequency plasmon mode for metallic nanoribbon appears due to increase of magnetic field. Furthermore, the number of collective excitation modes increases with ribbon width at zero magnetic field. Finally, the temperature dependence of the static charge structure factor of armchair graphene nanoribbon is studied. The effects of both magnetic field and ribbon width on the static charge structure factor are discussed in detail.

Key words: armchair graphene nanoribbon, Green's function

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

  • 73.22.-f
72.80.Vp (Electronic transport in graphene) 73.63.-b (Electronic transport in nanoscale materials and structures)