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Graphene plasmons are important collective excitations in graphene, which play a key role in determining the optical properties of graphene. They have quite lots of unique features in comparison with classical plasmons in noble metals. Of them, the active tunability is the most attractive, which is realized by external gating (equivalently electric field). As is well known, graphene also has strong magnetic response (e.g. room temperature quantum Hall effect), so magnetic field can act as another degree of freedom for actively tuning graphene plasmons, with the new quasi particles being so-called graphene magneto-plasmons. Because of the two-dimensional nature of graphene, the numerical studies (or full wave simulations) of graphene magneto-plasmons are usually carried out through a three-dimensional approximation, e.g. treating two-dimensional graphene as a very thin three-dimensional film. Actually, this treatment takes quite some time and requires high memory consumption. Herein, starting from Coulomb law and charge conservation law, we propose an alternative numerical method, namely, two-dimensional finite element method, to solve this problem. All the calculations are now performed in two-dimensional graphene plane, and the usual three-dimensional approximation is not required. To characterize the excitations of graphene magneto-plasmons, the eigenvalue loss spectrum is introduced. Based on this method, graphene magneto-plasmons in graphene rings of four kinds are investigated. The strongest magneto-optic effect is observed in circular ring, which is consistent with its highest rotational symmetry. In all the rings, the lowest dipolar graphene magneto-plasmon always supports symmetric mode splitting, which can be further modified by the interaction between inner edge and outer edge of ring. As the hole size is very small, the edge current confined to the outer edge dominates, and that confined to the inner edge can be ignored; while increasing the hole size, the interaction between these two edges increases, which results in the reduction of the symmetric mode splitting; when the hole size is larger than a critical value, the symmetric mode splitting will disappear.
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Keywords:
- graphene /
- magneto-plasmon /
- finite element method /
- eigenvalue loss spectrum
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图 1 石墨烯圆环(a)、方环(b)、方孔圆环(c)、圆孔方环(d)网格划分示意图, 环的直径或边长均为100 nm, 孔的直径或边长均为50 nm
Figure 1. Schematic diagrams of mesh generation for graphene circular ring (a), square ring (b), circular ring with square hole (c), and square ring with circular hole (d). The diameteror side length of ring is 100 nm, and that of hole is 50 nm.
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[1] Barnes W L, Dereux A, Ebbesen T W 2003 Nature 424 824Google Scholar
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[36] Geim A K, Novoselov K S 2007 Nat. Mater. 6 183Google Scholar
[37] Castro Neto A H, Guinea F, Peres N M R, Novoselov K S, Geim A K 2009 Rev. Mod. Phys. 81 109Google Scholar
[38] Das Sarma S, Adam S, Hwang E H, Rossi E 2011 Rev. Mod. Phys. 83 407Google Scholar
[39] Mas-Balleste R, Gomez-Navarro C, Gomez-Herrero J, Zamora F 2011 Nanoscale 3 20Google Scholar
[40] Fiori G, Bonaccorso F, Iannaccone G, Palacios T, Neumaier D, Seabaugh A, Bnerjee S K, Colombo L 2014 Nat. Nanotechonl. 9 768Google Scholar
[41] Novoselov K S, Mishchenko A, Carvalho A, Castro Neto A H 2016 Science 353 aac9439Google Scholar
[42] Wunsch B, Stauber T, Sols F, Guinea F 2006 New J. Phys. 8 318Google Scholar
[43] Hwang E H, Das Sarma S 2007 Phys. Rev. B 75 205418Google Scholar
[44] Polini M, Asgari R, Borghi G, Barlas Y, Pereg-Barnea T, MacDonald A H 2008 Phys. Rev. B 77 081411Google Scholar
[45] Jablan M, Buljan H, Soljacic M 2009 Phys. Rev. B 80 245435Google Scholar
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[47] Brar V W, Jang M S, Sherrott M, Lopez J J, Atwater H A 2013 Nano Lett. 13 2541Google Scholar
[48] de Abajo F J G 2014 ACS Photon. 1 135Google Scholar
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[50] Fei Z, Rodin A S, Andreev G O, Bao W, Mcleod A S, Wagner M, Zhang L, Zhao Z, Thiemens M, Dominguez G, Fogler M M, Castro Neto A H, Lau C N, Keilmann F, Basov D N 2012 Nature 487 82Google Scholar
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[52] Du X, Skachko I, Barker A, Andrei E Y 2008 Nat. Nanotechnol. 3 491Google Scholar
[53] Bolotin K I, Sikes K J, Hone J, Stormer H L, Kim P 2008 Phys. Rev. Lett. 101 096802Google Scholar
[54] Ju L, Geng B, Horng J, Girit C, Martin M, Hao Z, Bechtel H A, Liang X, Zettl A, Shen Y R, Wang F 2011 Nature Nanotechnol. 6 630Google Scholar
[55] Yan H, Li X, Chandra B, Tulevski G, Wu Y, Freitag M, Zhu W, Avouris P, Xia F 2012 Nature Nanotechnol. 7 330Google Scholar
[56] Low T, Avouris P 2014 ACS Nano 8 1086Google Scholar
[57] 吴晨晨, 郭相东, 胡海, 杨晓霞, 戴庆 2019 68 148103Google Scholar
Wu C C, Guo X D, Hu H, Yang X X, Dai Q 2019 Acta Phys. Sin. 68 148103Google Scholar
[58] Eda G, Maier S A 2013 ACS Nano 7 5660Google Scholar
[59] Xia F, Wang H, Xiao D, Dubey M, Ramasubramaniam A 2014 Nat. Photon. 8 899Google Scholar
[60] Li Y, Li Z, Cheng C, Shan H, Zheng L, Fang Z 2017 Adv. Sci. 4 1600430Google Scholar
[61] Zhang Y, Tan Y, Stormer H L, Kim P 2005 Nature 438 201Google Scholar
[62] Novoselov K S, Jiang Z, Zhang Y, Morozov S V, Stormer H L, Zeitler U, Maan J C, Boebinger G S, Kim P, Geim A K 2007 Science 315 1379Google Scholar
[63] Guinea F, Katsnelson M I, Geim A K 2010 Nat. Phys. 6 30Google Scholar
[64] Du X, Skachko I, Duerr F, Luican A, Andrei E Y 2009 Nature 462 192Google Scholar
[65] Bolotin K L, Ghahari F, Shulman M D, Stormer H L, Kim P 2009 Nature 462 196Google Scholar
[66] Dean C R, Young A F, Cadden-Zimansky P, Wang L, Ren H, Watanabe K, Taniguchi T, Kim P, Hone J, Shepard K L 2011 Nat. Phys. 7 693Google Scholar
[67] Kane C L, Mele E J 2005 Phys. Rev. Lett. 95 226801Google Scholar
[68] Ferreira A, Rappoport T G, Cazalilla M A, Castro Neto A H 2014 Phys. Rev. Lett. 112 066601Google Scholar
[69] Crassee I, Levallois J, Walter A L, Ostler M, Bostwick A, Rotenberg E, Seyller T, ven der Marel D, Kuzmenko A B 2011 Nat. Phys. 7 48Google Scholar
[70] Fallahi A, Perruisseau-Carrier J 2012 Appl. Phys. Lett. 101 231605Google Scholar
[71] Sounas D L, Skulason H S, Nguyen H V, Guermoune A, Slaj M, Szkopek T, Caloz C 2013 Appl. Phys. Lett. 102 191901Google Scholar
[72] Shimano R, Yumoto G, Yoo J Y, Matsunaga R, Tanabe S, Hibino H, Morimoto T, Aoki H 2013 Nat. Commun. 4 1841Google Scholar
[73] Fetter A L 1985 Phys. Rev. B 32 7676Google Scholar
[74] Mast D B, Dahm A J, Fetter A L 1985 Phys. Rev. Lett. 54 1706Google Scholar
[75] Wu J, Hawrylak P, Eliasson G, Quinn J J 1986 Phys. Rev. B 33 7091Google Scholar
[76] Armelles G, Cebollada A, Garcia-Martin A, Gonzalez M U 2013 Adv. Opt. Mater. 1 10Google Scholar
[77] Poumirol J M, Liu P Q, Slipchenko T M, Nikitin A Y, Martin-Moreno L, Faist J, Kuzmenko A B 2017 Nat. Commun. 8 14626Google Scholar
[78] Bychkov Y A, Martinez G 2008 Phys. Rev. B 77 125417Google Scholar
[79] Berman O L, Gumbs G, Lozovik Y E 2008 Phys. Rev. B 78 085401Google Scholar
[80] Wu J, Chen S, Roslyak O, Gumbs G, Lin M 2011 ACS Nano 5 1026Google Scholar
[81] Crassee I, Orlita M, Potemski M, Walter A L, Ostler M, Seyller T H, Gaponenko I, Chen J, Kuzmenko A B 2012 Nano Lett. 12 2470Google Scholar
[82] Ferreira A, Peres N M R, Castro Neto A H 2012 Phys. Rev. B 85 205426Google Scholar
[83] Mishchenko E G, Shyton A V, Silvestrov P G 2010 Phys. Rev. Lett. 104 156806Google Scholar
[84] Petkovic I, Williams F I B, Bennaceur K, Portier F, Roche P, Glattli D C 2013 Phys. Rev. Lett. 110 016801Google Scholar
[85] Sokolik A A, Lozovik 2019 Phys. Rev. B 100 125409Google Scholar
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[87] Kumada N, Roulleau P, Roche B, Hashisaka M, Hibino H, Petkovic I, Glattli D C 2014 Phys. Rev. Lett. 113 266601Google Scholar
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