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石墨烯超快动态光学性质

金芹 董海明 韩奎 王雪峰

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石墨烯超快动态光学性质

金芹, 董海明, 韩奎, 王雪峰

Ultrafast dynamic optical properties of graphene

Jin Qin, Dong Hai-Ming, Han Kui, Wang Xue-Feng
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  • 通过建立石墨烯的光学布洛赫方程, 研究了弱光场下的单层石墨烯超快动态光学性质. 理论研究表明在太赫兹辐射光场下由于泡利不相容和能量守恒原理使得石墨烯系统建立动态非平衡载流子并达到饱和的时间是20200 fs, 能够在1 ps之内迅速产生光电流. 研究发现2evF E0 tħ是石墨烯线性光学响应区; 否则是石墨烯系统非线性光学响应区, E0 和 分别对应入射光的强度和频率, t为时间, vF是石墨烯狄拉克点附近电子的费米速度. 研究发现光子能量ħ越大, 电极化强度以及光电流越强. 我们的理论研究结果与已有的众多实验结果一致, 表明石墨烯在超快动态光学领域尤其是太赫兹领域拥有重要的研究和应用价值.
    Graphene exhibits excellent ultrafast optical properties due to its unique electronic structure. In this paper we investigate theoretically the ultrafast dynamic optical properties of graphene based on the Bloch-equations, and introduce the theoretical model of graphene. First, we give the energy which has a linear relationship with the wave vector k. The behavior of electrons in the vicinity of the two Dirac points can be described by the massless Dirac-equation, thus we have the Dirac equation of graphene. Second, we discuss the interaction between graphene and light field. The Bloch-equations of graphene are obtained through the Heisenberg equation and then we discuss the photon carriers,electric polarization and optical current change over time by analyzing the Bloch-equations. It is found that the nonequilibrium carriers in graphene induced by a terahertz field can be built in 20-200 fs due to the Pauli blocking and the conservation of energy principle. The photon carrier density will increase with the frequency of enhanced light field. Thus an optical current can be created rapidly within 1 ps. A graphene system responds linearly to the external optical field for 2evFE0tħ, while the graphene systems respond nonlinearly to the external optical field, where E0 and are respectively the intensity and the frequency of the light, t is the time and vF the Dirac velocity in graphene. The electric polarization and optical current increase with increasing photon energies. These theoretical results are in agreement with recent experimental findings and indicate that graphene exhibits important features and has practical applications in the ultrafast optic filed, especially in terahertz field.
      通信作者: 董海明, hmdong@cumt.edu.cn
    • 基金项目: 中央高校基本科研业务费专项基金(批准号: 2013QNA29)和国家自然科学基金(批准号: 11247002)资助的课题.
      Corresponding author: Dong Hai-Ming, hmdong@cumt.edu.cn
    • Funds: Project supported by the Fundamental Research Funds for the Central Universities of Ministry (Grant No.2013QNA29), and by the National Natural Science Foundation of China (Grant No. 11247002).
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  • [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]

    Novoselov K S, Jiang D, Schedin F, Booth T J, Khotkevich V V, Morozov S V, Geim A K 2005 Science 102 10451

    [3]

    Geim A K, MacDonald A H 2007 Phys. Today 60 35

    [4]

    Williams J R, Di C L, Marcus C M 2007 Science 317 638

    [5]

    Nomura K, Mac A H 2006 Phys. Rev. Lett. 96 6602

    [6]

    Brink J 2007 Nat. Nanotechnol. 2 199

    [7]

    Zhang Y B, Tan Y W, Stormer H L, Kim P 2005 Nature 438 201

    [8]

    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 1379

    [9]

    Heersche H B, Jarillo H P, Oostinga J B, Vandersypen L M K, Morpurgo A F 2007 Solid State Commun 143 72

    [10]

    Vozmediano M A H, Lopez-Saneho M P, Stauber T, Guinea F 2005 Phys. Rev. B 72 5121

    [11]

    Dragoman M, Dragoman D, Deligiorgis G, Konstantinidis G, Neculoiu D, Cismaru A, Plana R 2009 J. Appl. Phys. 106 044312

    [12]

    Xia F N, Mueller T, Lin Y M, Valdes-Garcia A, Avouris P 2009 Nat. Nanotechnol. 4 839

    [13]

    Kim K, Choi J Y, Kim T, Cho S H, Chung H J 2011 Nature 479 338

    [14]

    Fang Z Y, Wang Y M, Schlather A E, Liu Z, Ajayan P M, F. Javier Garcia de Abajo, Nordlander P, Zhu X, Halas N J 2014 Nano Lett. 14 299

    [15]

    Fang Z Y, Liu Z, Wang Y M, Ajayan P M, Nordlander P, Halas N J 2012 Nano Letters 12 3808

    [16]

    Fang Z Y, Thongrattanasiri S, Schlather A, Liu Z, Ma L L, Wang Y M, Ajayan P M, Nordlander P, Halas N J, F. v Javier Garc. ade Abajo 2013 ACS Nano 7 2388

    [17]

    Yan B, Yang X X, Fang J Y, Huang Y D, Qin H, Qin S Q 2015 Chin. Phys. B 24 015023

    [18]

    Hendry E, Hale P J, Moger J and Savchenko A K 2010 Phys. Rev. Lett. 105 097401

    [19]

    Bao Q L, Zhang H, Wang Y, Ni Z H, Yan Y L, Shen Z X, Loh K P, Tang D Y 2009 Adv. Funct. Mater. 19 3077

    [20]

    Ruzicka B A, Wang S, Liu J W, Loh K P, Wu J Z, Zhao H 2012 Optics Materials Express 2 708

    [21]

    Dawlaty J M, Shivaraman S, Chandrashekhar M, Rana F, Spencer M G 2008 Applied Physics Letters 92 042116

    [22]

    Liu Z B, Zhao X, Zhang X L, Yan X Q, Wu Y P, Chen Y S, Tian J G 2011 The Journal of Physical Chemistry Letters 2 1972

    [23]

    Xing G H, Guo H C, Zhang X H, Sum T C, Huan C H A 2010 Optics Express 18 4564

    [24]

    Brida D, Manzoni C, Cerullo G, Tomadin A, Polini M, Nair R R, Geim A K, Novoselov K S, Milana S, Lombardo A, Ferrari A C 2012 Conference on Lasers and Electro-Optics San Jose, California United States, May 60-11, 2012 pQTh3H.1

    [25]

    Sun D, Divin C, Mihnev M, Winzer T, Malic E, Knorr A, Sipe J E, Berger C, Heer W A D, First P N, Norris T B 2012 New Journal of Physics 14 105012

    [26]

    Søren Ulstrup, Johannsen J C, Crepaldi A, Cilento F, Zacchigna M, Cacho C, Chapman R T, Springate E, Fromm F, Raidel C, Seyller T, Parmigiani F, Grioni M Hofmann P 2015 J. Phys.: Condensed Matter 27 164206

    [27]

    Liu M, Yin X B, Ulin-Avila E, Geng B S, Zentgraf T, Ju L, Wang F, Zhang X 2011 Nature 474 64

    [28]

    Breusing M, Kuehn S, Winzer T, Malic E, Milde F, Severin N, Rabe J P, Ropers C, Knorr A, Elsaesser T 2011 Phys. Rev. B 83 153410

    [29]

    Xu W, Dong H M, Li L L, Yao J Q, Vasilopoulos P, Peeters F M 2010 Phys. Rev. B 82 125304

    [30]

    Dong H M, Han K, Xu W 2014 Journal of Applied Physics 115 063503

    [31]

    Dong H M 2013 Acta Phys. Sin. 62 237804 (in Chinese) [董海明 2013 物理学报 62 237804]

    [32]

    Ang Y S, Chen Q J, Zhang C 2015 Front. Optoelectron. 8 3

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出版历程
  • 收稿日期:  2015-06-30
  • 修回日期:  2015-08-15
  • 刊出日期:  2015-12-05

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