...
首页> 外文期刊>Physical review >Observation of breather excitons and soliton in a substituted polythiophene with a degenerate ground state
【24h】

Observation of breather excitons and soliton in a substituted polythiophene with a degenerate ground state

机译:简并基态取代聚噻吩中通气激子和孤子的观察

获取原文
获取原文并翻译 | 示例
           

摘要

We investigated the ultrafast dynamics of a unique polythiophene derivative that has a degenerate ground state due to an alternating benzenoid-quinoid resonance. We probed 128 different wavelengths at the same time by using a sub-5-fs pulse laser and a detection system composed of a polychromator and a multichannel lock-in amplifier. The method allowed us to study the electronic relaxation and vibrational dynamics in completely same conditions at the same time. Because the polythiophene derivative has degenerate ground state, solitons are expected to be generated after photoexcitation. The dynamics of a breather composed of a dynamic bound state of solitons generated immediately after photoexcitation was time-resolved to reveal coupling between the vibrational modes and the solitons. The C-C and C=C stretching modes were found to be modulated by the breather, whose lifetime was determined to be 30-50 fs. The results of quantum-chemical excited-state molecular dynamics simulation are consistent with experimental results. Our modeling results allow to identify related vibrational normal modes strongly coupled to the electronic degrees of freedom. Moreover, analysis of calculated trajectories of excited state shows appearance of short-lived breather excitation decaying due to intramolecular vibrational energy equilibration on a time scale of hundreds of femtoseconds, which also agrees well with the experimental results.
机译:我们研究了一种独特的聚噻吩衍生物的超快动力学,该衍生物由于交替的苯甲醌-醌共振而具有简并的基态。我们使用5阶以下fs脉冲激光和由多色仪和多通道锁定放大器组成的检测系统,同时探测了128个不同的波长。该方法使我们能够同时研究完全相同条件下的电子弛豫和振动动力学。由于聚噻吩衍生物具有简并的基态,因此预计在光激发后会产生孤子。时间分辨由光激发后立即产生的孤子的动态束缚状态组成的呼吸器的动力学,以揭示振动模式与孤子之间的耦合。发现C-C和C = C拉伸模式由通气孔调节,通气孔的寿命确定为30-50 fs。量子化学激发态分子动力学模拟的结果与实验结果一致。我们的建模结果可以确定与电子自由度紧密相关的相关振动法线模式。此外,对激发态的计算轨迹的分析表明,由于在数百飞秒的时间内分子内的振动能量平衡,短寿命的呼吸器激发出现了衰减,这也与实验结果非常吻合。

著录项

  • 来源
    《Physical review》 |2010年第7期|p.075205.1-075205.7|共7页
  • 作者单位

    Department of Applied Physics and Chemistry and Institute for Laser Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan JST, ICORP, Ultrashort Pulse Laser Project, , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan Department of Electrophysics, National Chiao Tung University, 1001 Ta Hsueh Road, Hsin-Chu 3005, Taiwan Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka 565-0871, Japan;

    Department of Applied Physics and Chemistry and Institute for Laser Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan JST, ICORP, Ultrashort Pulse Laser Project, , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan;

    School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People's Republic of China;

    Shimane Institute for Industrial Technology, 1 Hokuryo-cho, Matsue, Shimane 690-0816, Japan;

    Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    organic compounds and polymers;

    机译:有机化合物和聚合物;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号