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碱基对组分、电极位能及界面耦合对DNA分子I-V特性的影响

马松山 朱佳 徐慧 郭锐

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碱基对组分、电极位能及界面耦合对DNA分子I-V特性的影响

马松山, 朱佳, 徐慧, 郭锐

Base pairs composition, on-site energies of electrode and DNA-metal coupling effects on current-voltage characteristic of DNA molecule

Ma Song-Shan, Zhu Jia, Xu Hui, Guo Rui
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  • 在紧束缚近似下,利用传输矩阵方法,计算研究了碱基对组分、金属电极位能及DNA分子与电极耦合强度对DNA分子I-V特征的影响.计算结果表明:由单一碱基对构成的DNA分子的饱和电流强度远大于由两种碱基对按一定组分随机分布的DNA分子的饱和电流强度,且当DNA分子中两种碱基对的含量相等时,其饱和电流强度最小.同时,富含C-G碱基对的DNA分子比富含A-T碱基对的DNA分子的电子输运能力大.金属电极位能对DNA分子电子输运的影响体现在两方面,当偏压较小时,电极位能具有阻碍电荷注入的效果,当偏压较大时
    Based on a tight-binding approximation and transfer matrix method, we investigated the effects of the composition of nucleotide base pairs, on-site energies of the electrode and DNA-metal coupling strength on the current-voltage characteristic. The results indicate that the saturation current of DNA molecule which is composed of one single kind of nucleotide base pair is much higher than that composed of two kinds of nucleotide base pair. Meanwhile, the DNA molecule which is rich in G-C base pairs has higher electronic transport ability. When the bias is low, the on-site energies of the electrode have the effect of impeding charge injection. On the other hand, when the bias is high, the on-site energies of the electrode have the effect of enhancing charge injection. In addition, we can find that a stronger DNA-metal coupling does not always result in a larger saturation current. When tdm=td, there is a resonance injection, which is optimized for electron transport. When tdm departs from td, the resonance injection is reduced, which lead to the stronger of DNA-metal coupling at the range of tdm>td and the lower of saturation current of DNA.
    • 基金项目: 高等学校博士学科点专项科研基金(批准号:20070533075)和湖南省科技计划(批准号:2009FJ3004)资助的课题.
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    [2]

    Weiss P S, Bumm L A, Dunbar T D, Burgin T P, Tour J M, Allara D L 1998 Molecular Electronics: Science and Technology (New York: New York Academy of Sciences) p14

    [3]

    Chen J, Wang W, Klemic J, Reed M A, Axelrod B W, Kaschak D M 2002 Molecular Electronics Ⅱ(New York: New York Academy of Sciences) p69

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    Chen L N, Ma S S, Ouyang F P, Wu X Z, Xiao J, Xu H 2010 Chin. Phys. B 19 097301

    [6]

    Li Z L, Li H Z, Ma Y, Zhang G P, Wang C K 2010 Chin. Phys. B 19 067305

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    Mauro D E, Hollenberg C P 1993 Adv. Mat. 5 384

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    Niemeyer C M 2001 Angew. Chem. Int. Ed. 40 4128

    [10]

    Bean L T, Yan H, Kopatsch J, Liu F, Winfree E, Reif J H, Seeman N C 2000 J. Am. Chem. Soc. 122 1848

    [11]

    Seeman N C 2001 Nano Lett. 1 22

    [12]

    Braun E, Eichen Y, Sivan U, Ben-Yoseph G 1998 Nature 391 775

    [13]

    Zhang Y, Austin R H, Kraeft J, Cox E C, Ong N P 2002 Phys. Rev. Lett. 89 198102

    [14]

    de Pablo P J, Moreno-Herrero F, Colchero J 2000 Phys. Rev. Lett. 85 4992

    [15]

    Porath D, Bezryadin A, de Vries S, Dekker C 2000 Nature 403 635

    [16]

    Li K, Dong R X, Ban G, Han H W, Su W, Yan X L 2009 Acta Phys. Sin. 58 6477 (in Chinese) [李 珂、董瑞新、班 戈、韩洪文、苏 伟、闫循领 2009 物理学报 58 6477]

    [17]

    Fink H W, Schonenberger C 1999 Nature 398 407

    [18]

    Kasumov A Y, Kociak M, Gueron S, Reulet B, Volkov V T, Klinov D V, Bouchiat H 2001 Science 291 280

    [19]

    Myeong H L, Sankey O F 2009 Phys. Rev. E 79 051911

    [20]

    Mallajosyula S S, Lin J C, Cox D L, Pati S K, Singh R R P 2008 Phys. Rev. Lett. 101 176805

    [21]

    Liu T, Wang Y, Wang K L 2007 Chin. Phys. 16 272

    [22]

    Guo A M, Xiong S J, Yang Z, Zhu H J 2008 Phys. Rev. E 78 061922

    [23]

    Benjanim B, Schmidt, Matthias H H, Gerd S 2007 Phys. Rev. B 75 115125

    [24]

    Meng X L, Gao X T, Qu Z, Kang D W, Liu D S, Xie S J 2008 Acta Phys. Sin. 57 5316 (in Chinese) [孟宪兰、高绪团、渠 朕、康大伟、刘德胜、解士杰 2008 物理学报 57 5316]

    [25]

    Ma S S, Xu H, Wang H Y, Guo R 2009 Chin. Phys. B 18 3591

    [26]

    Malyshev A V 2007 Phys. Rev. Lett. 98 096801

    [27]

    Stephan R 2003 Phys. Rev. Lett. 91 108101

    [28]

    Gianaurelio C, Luis C, Danny P, Dekker C 2002 Phys. Rev. B 65 241314

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出版历程
  • 收稿日期:  2010-03-31
  • 修回日期:  2010-05-04
  • 刊出日期:  2010-05-05

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