光激发下分子纳米结中电荷输运的振动效应研究

李金花; 王鹿霞

doi:10.7498/aps.60.117310

摘要

在纳米金属电极和分子组成的分子纳米结中,应用分子振动的简正坐标在弱耦合近似下研究了在光激发作用下电荷的输运过程,并从电离能的角度分析了顺序电荷转移的机理,研究了在光激发条件下分子纳米结的电流-电压特性. 发现分子的振动效应是Franck-Condon阻滞在光激发作用下消失的关键因素,进而在理论上分析了分子的电离能在电荷输运中的作用,同时分析了IVR效应对光激发下分子纳米结中电荷输运的影响.

关键词:

With the weak-coupling approach in molecular vibrational normal coordinate, the charge transmission under external optical field through molecular nano-junction is studied. From the charging energy point of view, the sequential charge transmission is analyzed and the current-voltage characteristics under external optical field are studied. It is found that the vibrational effect of molecule is the key factor of the removal of Franck-Condon blockage under external optical field. Furthermore, the effects of charging energy and intra-molecular vibrational energy redistribution (IVR) in charge transmission under external optical field are studied in detail.

Keywords:

作者及机构信息

1.
北京科技大学数理学院物理系,北京 100083

基金项目: 中央高校基本科研业务费专项资金和国家自然科学基金(批准号:11174029)资助的课题.

Authors and contacts

1.
Department of Physics, School of Mathematics and Physics, University of Science and Technology Beijing,Beijing 100083, China

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施引文献

[1]	Stipe B C, Rezaei M A, Ho W 1999 Rev. Sci. Instrum. 70 137
[2]
[3]	Qiu X H, Nazin G V, Ho W 2004 Phys. Rev. Lett. 92 206102
[4]
[5]	May V, Khn O 2006 Chem. Rev. Lett. 420 192
[6]	May V, Khn O 2008 Phys. Rev. B 77 115440
[7]
[8]
[9]	Ng M K, Lee D C, Yu L 2002 J. Am. Chem. Soc. 124 11862
[10]	Geng H, Hu Y, Shuai Z, Xia K, Gao H, Chen K 2007 J. Phys. Chem. C 111 19098
[11]
[12]	Gaudioso J, Laudon J L, Ho W 2000 Phys. Rev. Lett. 85 1918
[13]
[14]
[15]	Park H, Park J, Lim A K L, Anderson E H, Alivisators A P, McEuen P L 2000 Nature (London) 407 57
[16]	Joachim C, Ratne M A 2005 Proc. Natl. Acad. Sci. U.S.A. 102 8800
[17]
[18]
[19]	Song H, Kim Y, Jang Y H, Jeong H, Reed M A, Lee T 2009 Nature 462 1039
[20]
[21]	Huo X X, Wang C, Zhang X M, Wang L G 2010 Acta Phys. Sin. 59 4955 (in Chinese) [霍新霞、张秀梅、王利光 2010 物理学报 59 4955]
[22]	An Y P, Yang C L, Wang M S, Ma X G, Wang D H 2010 Acta Phys. Sin. 59 2010(in Chinese) [安义鹏、杨传路、王美山、马晓光、王德华 2010 物理学报 59 2010]
[23]
[24]	Galperin M, Ratner M A, Nitzan A 2005 J. Chem. Phys. 121 11965
[25]
[26]
[27]	Li Z L, Wang C K, Luo Y, Xue Q K 2004 Acta Phys. Sin. 53 1490 (in Chinese) [李宗良、王传奎、罗毅、薛其坤 2004 物理学报 53 1490]
[28]	Chen L, Hu Z, Zhao A, Wang B, Luo Y, Yang J, Hou J G 2007 Phys. Rev. Lett. 99 146803
[29]
[30]
[31]	Welack S, Madddox J B, Esposito M, Harbola U, Mukamel S 2008 Nano Lett. 8 1137
[32]
[33]	Li G, Schreiber M, Kleinekathofer U 2007 Euro. Phys. Lett. 79 27006
[34]
[35]	Li G, Welack S, Schreiber M, Kleinekathofer U 2008 Phys. Rev. B 77 075321
[36]
[37]	May V, Khn O 2008 Phys. Rev. B 77 115439
[38]
[39]	Zhang Y, Wang L X 2010 Acta Phys. Sin. 59 5412 (in Chinese) [张元、王鹿霞 2010 物理学报 59 5412]
[40]
[41]	Wang L, May V 2010 J. Phys. Chem. C 114 4179
[42]
[43]	Wang L, May V 2010 Chem. Phys. 375 252

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