二维链间扩展的极化子动力学研究

刘文; 刘德胜; 李海宏

doi:10.7498/aps.59.6405

摘要

基于扩展的SSH模型,研究了有序耦合聚合物链系统中的极化子动力学,包括极化子的形成过程及其在外场下的输运.发现,当聚合物链间的耦合较强时,注入到系统中的电子会诱发二维链间扩展的极化子态,分布在多条聚合物链上.另外,动力学模拟表明,与一维链内定域极化子相比,在相同的电场强度下二维极化子具有更大的运动速度,这与实验结果一致.

关键词:

链间扩展极化子 /
链间耦合

Based on the SSH model, polaron dynamics in a system of highly ordered conjugated polymer chains is investigated, including polaron formation and transport in the presence of an external electric field. It is found that, beyond a certain strength of the interchain coupling, the injected electron will induce a two-dimensional delocalized polaron state, expanding over several chains. Dynamical simulations suggest that, under the same electric field, two-dimensional interchain delocalized polarons move faster than intrachain localized polarons, as suggested by earlier experiments.

Keywords:

interchain delocalized polaron /
interchain coupling

作者及机构信息

(1)济宁学院物理与信息工程系,曲阜 273155; (2)济宁学院物理与信息工程系,曲阜 273155;山东大学物理学院,济南 250100

基金项目: 国家重点基础研究发展计划(973计划)(批准号: 2009CB929204)资助的课题.

Authors and contacts

(1)Department of Physics and Information Engineering,Jining University,Qufu 273155, China; (2)Department of Physics and Information Engineering,Jining University,Qufu 273155, China;School of Physics,Shandong University,Jinan 250100, China

参考文献

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[5]	Heeger A J, Kivelson S, Schrieffer J R, Su W P 1988 Rev. Mod. Phys. 60 782
[6]	Li H H, Li D M, Liu W 2008 Acta Phys. Sin. 57 1117(in Chinese) [李海宏、李冬梅、刘文 2008 物理学报 57 1117]
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[9]	An Z, Wu C Q, Sun X 2004 Phys. Rev. Lett. 93 216407
[10]	An Z, Di B, Zhao H, Wu C Q 2008 Eur. Phys. J. B 63 71
[11]	Shi J, Gao K, Lei J, Xie S J 2009 Acta Phys. Sin. 58 (in Chinese)[史晶、高琨、雷杰、解士杰 2009 物理学报 58 459]
[12]	Blackman J A, Sabra M K 1990 Polymer 31 621
[13]	Fesser K 1989 Phys. Rev. B 40 1962
[14]	Gao K, Liu X J, Liu D S, Xie S J 2008 Phys. Lett. A 372 2490
[15]	Lanzani G, Frolov S V, Lane P A 1997 Phys. Rev. Lett. 79 3066
[16]	McCullough R D 1998 Adv. Mater 10 93
[17]	Lane P A, Liess M, Wei X 1998 Chem. Phys. 227 57
[18]	Dodabalapur A, Bao Z, Makhija A 1998 Appl. Phys. Lett. 73 142
[19]	Sirringhaus H, Brown P J, Friend R H 1999 Nature 401 685
[20]	sterbacka R, An C P, Jiang X M 2000 Science 287 839
[21]	Johansson , Stafstrm S 2002 Phys. Rev. B 65 045207
[22]	Johansson  A, Stafstrm S 2004 Phys. Rev. B 69 235205
[23]	Johansson , Stafstrm S 2002 Phys. Rev. B 66 085208
[24]	Su W P, Schrieffer J R, Heeger A J 1980 Phys. Rev. B 22 2099
[25]	Li Y, Liu X J, Fu J Y 2006 Phys. Rev. B 74 184303
[26]	Wu C Q, Qiu Y, An Z, Nasu K 2003 Phys. Rev. B 68 125416

施引文献

[1]	Chang C K, Fincher C R, Park Y W, Heeger A J, Shirakawa H, Louis E J, Gau S C, MacDiarmid A G 1977 Phys. Rev. Lett. 39 1098
[2]	Campbell I H, Smith D L 2001 Solid State Physics 55 1
[3]	Brabec C J, Sariciftci N S, Hummelen J C 2001 Adv. Funct. Mater. 11 15
[4]	Su W P, Schrieffer J R, Heeger A J 1979 Phys. Rev. Lett. 42 1698
[5]	Heeger A J, Kivelson S, Schrieffer J R, Su W P 1988 Rev. Mod. Phys. 60 782
[6]	Li H H, Li D M, Liu W 2008 Acta Phys. Sin. 57 1117(in Chinese) [李海宏、李冬梅、刘文 2008 物理学报 57 1117]
[7]	Lima M P, Silva G M 2006 Phys. Rev. B 74 224304
[8]	Sun Z, An Z, Li Y 2009 Acta Phys. Sin. 58 (in Chinese) [孙震、安忠、李元 2009 物理学报 58 4150]
[9]	An Z, Wu C Q, Sun X 2004 Phys. Rev. Lett. 93 216407
[10]	An Z, Di B, Zhao H, Wu C Q 2008 Eur. Phys. J. B 63 71
[11]	Shi J, Gao K, Lei J, Xie S J 2009 Acta Phys. Sin. 58 (in Chinese)[史晶、高琨、雷杰、解士杰 2009 物理学报 58 459]
[12]	Blackman J A, Sabra M K 1990 Polymer 31 621
[13]	Fesser K 1989 Phys. Rev. B 40 1962
[14]	Gao K, Liu X J, Liu D S, Xie S J 2008 Phys. Lett. A 372 2490
[15]	Lanzani G, Frolov S V, Lane P A 1997 Phys. Rev. Lett. 79 3066
[16]	McCullough R D 1998 Adv. Mater 10 93
[17]	Lane P A, Liess M, Wei X 1998 Chem. Phys. 227 57
[18]	Dodabalapur A, Bao Z, Makhija A 1998 Appl. Phys. Lett. 73 142
[19]	Sirringhaus H, Brown P J, Friend R H 1999 Nature 401 685
[20]	sterbacka R, An C P, Jiang X M 2000 Science 287 839
[21]	Johansson , Stafstrm S 2002 Phys. Rev. B 65 045207
[22]	Johansson  A, Stafstrm S 2004 Phys. Rev. B 69 235205
[23]	Johansson , Stafstrm S 2002 Phys. Rev. B 66 085208
[24]	Su W P, Schrieffer J R, Heeger A J 1980 Phys. Rev. B 22 2099
[25]	Li Y, Liu X J, Fu J Y 2006 Phys. Rev. B 74 184303
[26]	Wu C Q, Qiu Y, An Z, Nasu K 2003 Phys. Rev. B 68 125416

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