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

doi:10.1088/1674-1056/25/9/097303

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.

Keywords: armchair graphene nanoribbon Green's function

Received: 28 December 2015
Revised: 22 April 2016
Accepted manuscript online:

PACS:	73.22.-f	(Electronic structure of nanoscale materials and related systems)
	72.80.Vp	(Electronic transport in graphene)
	73.63.-b	(Electronic transport in nanoscale materials and structures)

Corresponding Authors: H Rezania,
E-mail: rezania.hamed@gmail.com

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H Rezania, F Azizi Charge susceptibilities of armchair graphene nanoribbon in the presence of magnetic field 2016 Chin. Phys. B 25 097303

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