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首页> 外文期刊>Physical review >Stark effect and Franz-Keldysh effect of a quantum wire realized by conjugated polymer chains of a diacetylene 3NPh2
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Stark effect and Franz-Keldysh effect of a quantum wire realized by conjugated polymer chains of a diacetylene 3NPh2

机译：通过二乙炔3NPh2的共轭聚合物链实现的量子线的Stark效应和Franz-Keldysh效应

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摘要

Conjugated polymer chains diluted in monomer single crystals of a diacetylene, 1,10-bis(diphenylamino)-4,6-decadiyne, represent quantum wires of long-range coherence. They differ from most polydiacetylenes by their repeat unit that consists of two C_4 units with twisted molecular planes. The resulting modification of exciton and band states is studied by electroabsorption which resolves an increase in the exciton transition energy to 2.399 eV and of the free-electron gap to 3.158 eV. The Stark shift of the exciton reveals a significant reduction in the exciton radius by about 40% to 6 ± 1 A which is consistent with a similar increase in the exciton binding energy to 759 meV. The line shape of electroabsorption spectra at the free-electron gap is for fields larger than 30 kV/cm in accordance with the one-dimensional Franz-Keldysh effect and yields a reduced mass of 0.07m_0 larger than in other polydiacetylene (PDA). Spectra at smaller fields are distorted by contributions of a weak dipole allowed and a forbidden exciton 38 and 12 meV, respectively, below the band gap. Coherent coupling of free electrons and vibrational modes leads to replicas of the Franz-Keldysh effect. Since light polarized parallel to the conjugated chain excites two propagating modes in the monomer crystals the quantitative analysis was restricted to electroabsorption spectra taken with perpendicular polarization in samples which transmit only the weakly absorbed polariton mode.
机译：稀释在二乙炔1,10-双（二苯基氨基）-4,6-癸二炔的单体单晶体中的共轭聚合物链代表了长程相干的量子线。它们与大多数聚二乙炔不同，它们的重复单元由两个具有扭曲分子平面的C_4单元组成。通过电吸收研究了激子和能带态的变化，它解决了激子跃迁能增加到2.399 eV和自由电子间隙增加到3.158 eV的问题。激子的斯塔克位移表明激子半径显着降低了约40％，达到6±1 A，这与激子结合能相似地增加至759 meV一致。根据一维Franz-Keldysh效应，对于大于30 kV / cm的场，在自由电子间隙处的电吸收光谱的线形是较大的，与其他聚二乙炔（PDA）相比，减小的质量为0.07m_0。较小的场的光谱会由于带隙下方的弱偶极子和禁带激子38和12 meV的贡献而失真。自由电子和振动模式的相干耦合导致Franz-Keldysh效应的复制。由于平行于共轭链偏振的光在单体晶体中激发了两种传播模式，因此定量分析仅限于仅吸收弱吸收极化子模式的样品中垂直极化所获得的电吸收光谱。

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  • 来源
    《Physical review》 |2010年第12期|p.125209.1-125209.11|共11页
  • 作者

    Gerhard Weiser; Laurent Legrand; Thierry Barisien; Antoine Al Choueiry; Michel Schott; Sylvain Dutremez;

  • 作者单位

    Fachbereich Physik, Philipps-Universitaet Marburg, 35032 Marburg, Germany;

    rnInstitut des NanoSciences de Paris (INSP), UMR 7588/CNRS, Universite Pierre et Marie Curie (Paris 6), Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France;

    rnInstitut des NanoSciences de Paris (INSP), UMR 7588/CNRS, Universite Pierre et Marie Curie (Paris 6), Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France;

    rnInstitut des NanoSciences de Paris (INSP), UMR 7588/CNRS, Universite Pierre et Marie Curie (Paris 6), Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France;

    rnInstitut des NanoSciences de Paris (INSP), UMR 7588/CNRS, Universite Pierre et Marie Curie (Paris 6), Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France;

    rnInstitut Charles Gerhardt Montpellier, UMR 5253/CNRSUM2-ENSCM-UM1, Equipe CMOS, Universite Montpellier II, Place Eugene Bataillon, 34095 Montpellier Cedex 5, France;

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    organic compounds and polymers; intrinsic properties of excitons; optical absorption spectra; spin-orbit coupling, zeeman and stark splitting, jahn-teller effect; electrooptical effects;

    机译：有机化合物和聚合物;激子的内在特性;吸收光谱自旋轨道耦合;塞曼和斯塔克分裂;詹恩-泰勒效应;电光效应;

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