Alternating-current small-signal admittances of armchair graphene nanoribbons are investigated using the method of non-equilibrium Green's function. The calculated ac admittances show an oscillatory response between inductive and capacitive behaviors, which is a result of the finite length of the graphene nanoribbon. The effects of hydrogen-passivated edges on ac response are demonstrated. At low frequency, the edge effects transform the inductive behavior in a metallic graphene nanoribbon into a capacitive one. Finally, the effects of variations in the width and bandgap of a graphene nanoribbon on its dynamic response are investigated.
Alternating-current small-signal admittances of armchair graphene nanoribbons are investigated using the method of non-equilibrium Green's function. The calculated ac admittances show an oscillatory response between inductive and capacitive behaviors, which is a result of the finite length of the graphene nanoribbon. The effects of hydrogen-passivated edges on ac response are demonstrated. At low frequency, the edge effects transform the inductive behavior in a metallic graphene nanoribbon into a capacitive one. Finally, the effects of variations in the width and bandgap of a graphene nanoribbon on its dynamic response are investigated.
[1] Wang X, Ouyang Y, Li X, Wang H, Guo J and Dai H 2008 Phys. Rev. Lett. 100 206803 [2] Guan X, Zhang M, Liu Q and Yu Z 2007 IEDM Tech. Dig. (Washington DC 10-12 December 2007) p 761 [3] Zhang M, Ran Q, Guan X and Yu Z 2008 Proc. SISPAD (Hakone, Japan 9-11 September 2008) p 165 [4] Naeemi A and Meindl J D 2007 IEEE Electron Device Lett. 28 428 [5] Shao Q, Liu G, Teweldebrhan D and Balandin A A 2008 Appl. Phys. Lett. 92 202108 [6] Berger C, Song Z, Li X, Wu X, Brown N, Naud C, Mayou D, Li T, Hass J, Marchenkov A N, Conrad E H, First P N and de Heer W A 2006 Science 312 1191 [7] Novoselov K S et al 2004 Science 306 666 [8] Son Y W, Cohen M L and Louie S G 2006 Phys. Rev. Lett. 97 216803 [9] Han M Y, Özyilmaz B, Zhang Y and Kim P 2007 Phys. Rev. Lett. 98 206805 [10] Anantram M P and Datta S 1995 Phys. Rev. B 51 7632 [11] Platero G and Aguado R 2004 Physics Rep. 395 1 [12] Wang B, Wang J and Guo H 1999 Phys. Rev. Lett. 82 398 [13] Roland C et al 2000 Phys. Rev. Lett. 84 2921 [14] He Y et al 2006 J. Phys.: Condens. Matter 18 8707 [15] Fu Y and Dudley S C 1993 Phys. Rev. Lett. 70 65
2010, Vol. 27 
