锯齿型石墨纳米带叠层复合结的电子输运

胡飞; 段玲; 丁建文

doi:10.7498/aps.61.077201

摘要

基于紧束缚格林函数方法,研究了两半无限长锯齿型石墨纳米带叠层复合结的电子输运性质.结果表明,层间次近邻相互作用、叠层区长度及门电压对复合结的电子透射谱有重要调制作用.层间次近邻相互作用导致复合结的透射谱关于费米能呈现非对称性,与实验结果很好相符.低于费米能第一子能区内周期性出现透射系数为0和1的台阶,呈现全反射与透射现象.随散射结长度增加,透射系数在1内周期性振荡,呈现明显的量子干涉效应.在门电压调控下,低于费米能的透射系数出现了从1到0的转变,类似于开关效应.相关结果对基于石墨烯器件的设计与应用有指导意义.

关键词:

Abstract

According to a tight-binding model and the Green's function formalism, we investigate the electronic transport in hybrid contact of doubly stacked zigzag graphene nanoribbons. Our study shows that the next nearest neighbor interlayer coupling, the hybrid contact length and gate voltage each have a significant modulation effect on the electron transmission spectrum. Due to the next nearest neighbor interlayer coupling, the transmission spectrum of the hybrid contact exhibits an electron-hole asymmetry, which is consistent with the experimental result. There exist some transmission gap (T=0) and quantum step (T=1) within the first subband below the Fermi energy, meaning that electrons can reflect and/or transmit completely. It is also observed that the transmission coefficient oscillates within 1 as the contact length increases, showing a quantum interference effect. Under a gate voltage in the bilayer regime, the transmission coefficient can be changed from 1 to 0, showing that a switching effect exists here. The results is useful for the design and the application of the graphene-based device.

Keywords:

作者及机构信息

1.
湘潭大学物理系, 纳米物理与稀土发光研究所, 湘潭 411105;

2.
湘潭大学低维材料及其应用技术教育部重点实验室, 湘潭 411105

基金项目: 国家自然科学基金(批准号:10674113;11074212);全国优秀博士学位论文作者专项基金(批准号:200726)资助的课题.

Authors and contacts

1.
Department of Physics & Institute of Nanophysics and Rare-earth Luminescence, Xiangtan 411105, China;

2.
Key Laboratory of Low Dimensional Materials & Application Technology, Xiangtan University, Xiangtan 411105, China

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 10674113 and 11074212), and the Foundation for the Author of National Excellent Doctoral Dissertation of China (Grant No. 200726).

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施引文献

[1]	Novoselov K S, Geim A K, Morozov S V, Jiang D, Zhang Y, Dubonos S V, Grigorieva I V, Firsov A A 2004 Science 306 666
[2]
[3]	Castro Neto A H, Guinea F, Peres N M R, Novoselov K S, Geim A K 2009 Rev. Mod. Phys. 81 109
[4]	Chen J H, Jang C, Xiao S, Ishigami M, Fuhrer M S 2008 Nat. Nano 3 206
[5]
[6]	Moser J, Barreiro A, Bachtold A 2007 Appl. Phys. Lett. 91 163513
[7]
[8]	Balandin A A, Ghosh S, Bao W, Calizo I, Teweldebrhan D, Miao F, Lau C N 2008 Nano Lett. 8 902
[9]
[10]
[11]	Kim K S, Zhao Y, Jang H, Lee S Y, Kim J M, Kim K S, Ahn J-H, Kim P, Choi J-Y, Hong B H 2009 Nature 457 706
[12]
[13]	Murali R, Brenner K, Yang Y, Beck T, Meindl J 2009 IEEE Electron Dev. Lett. 30 611
[14]	Oostinga J B, Heersche H B, Liu X, Morpurgo A F, Vandersypen L M K 2008 Nat. Mater. 7 151
[15]
[16]	Schwierz F 2010 Nat. Nano 5 487
[17]
[18]	Lin Y M, Avouris P 2008 Nano Lett. 8 2119
[19]
[20]
[21]	Xu H, Heinzel T, Zozoulenko I V 2009 Phys. Rev. B 80 045308
[22]
[23]	Areshkin D A, White C T 2007 Nano Lett. 7 3253
[24]
[25]	Rotenberg E, Bostwick A, Ohta T, McChesney J L, Seyller T, Horn K 2008 Nat. Mater. 7 258
[26]
[27]	Puls C P, Staley N E, Liu Y 2009 Phys. Rev. B 79 235415
[28]	Nilsson J, Castro Neto A H, Guinea F, Peres N M R 2007 Phys. Rev. B 76 165416
[29]
[30]	Nakanishi T, Koshino M, Ando T 2010 Phys. Rev. B 82 125428
[31]
[32]
[33]	Koshino M, Nakanishi T, Ando T 2010 Phys. Rev. B 82 205436
[34]	Gonzlez J W, Santos H, Pacheco M, Chico L, Brey L 2010 Phys. Rev. B 81 195406
[35]
[36]	Mucha-Kruczyński M, McCann E, Falko V I 2010 Semicond. Sci. Technol. 25 033001
[37]
[38]	Castro E, Novoselov K, Morozov S, Peres N, Santos J, Nilsson J, Guinea F, Geim A, Neto A 2010 J. Phys. Condens. Matter 22 175503
[39]
[40]
[41]	Li Z Q, Henriksen E A, Jiang Z, Hao Z, Martin M C, Kim P, Stormer H L, Basov D N 2009 Phys. Rev. Lett. 102 037403
[42]
[43]	Wright A, Liu F, Zhang C 2009 Nanotechnology 20 405203
[44]	Cortijo A, Oroszlny L, Schomerus H 2010 Phys. Rev. B 81 235422
[45]
[46]
[47]	Rhim J-W, Moon K 2008 J. Phys. Condens. Matter 20 365202
[48]
[49]	Wang X M, Liu H 2011 Acta Phys. Sin. 60 047102 (in Chinese) [王雪梅, 刘红 2011 60 047102]
[50]
[51]	Kuzmenko A B, Crassee I, van der Marel D, Blake P, Novoselov K S 2009 Phys. Rev. B 80 165406
[52]	Ohta T, Bostwick A, Seyller T, Horn K, Rotenberg E 2006 Science 313 951
[53]
[54]
[55]	Xu H, Heinzel T, Evaldsson M, Zozoulenko I V 2008 Phys. Rev. B 77 245401
[56]	Xu N, Ding J W, Xing D Y 2008 J. Appl. Phys. 103 083710
[57]
[58]	Bttiker M, Imry Y, Landauer R, Pinhas S 1985 Phys. Rev. B 31 6207
[59]
[60]	Jin Z F, Tong G P, Jiang Y J 2009 Acta Phys. Sin. 58 8537 (in Chinese) [金子飞, 童国平, 蒋永进 2009 58 8537]
[61]
[62]	Hu H X, Zhang Z H, Liu X H, Qiu M, Ding K H 2009 Acta Phys. Sin. 58 7156 (in Chinese) [胡海鑫, 张振华, 刘新海, 邱明, 丁开和 2009 58 7156]
[63]
[64]	Kuzmenko A B, van Heumen E, van der Marel D, Lerch P, Blake P, Novoselov K S, Geim A K 2009 Phys. Rev. B 79 115441
[65]
[66]
[67]	Buia C, Buldum A, Lu J P 2003 Phys. Rev. B 67 113409
[68]
[69]	Liu Q, Luo G, Qin R, Li H, Yan X, Xu C, Lai L, Zhou J, Hou S, Wang E 2011 Phys. Rev. B 83 155442
[70]
[71]	Liu Q, Yu L, Li H, Qin R, Jing Z, Zheng J, Gao Z, Lu J 2011 J. Phys. Chem. C 115 6933
[72]
[73]	Liao L, Bai J, Cheng R, Lin Y C, Jiang S, Qu Y, Huang Y, Duan X 2010 Nano Lett. 10 3952

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