Dephasing dynamics of photoexcited state in correlated electron system

相关电子系统中光激发态的相移动力学

基本信息

  • 批准号:
    16340085
  • 负责人:
  • 金额:
    $ 10.43万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    2004
  • 资助国家:
    日本
  • 起止时间:
    2004 至 2006
  • 项目状态:
    已结题

项目摘要

Photo-response of correlated electron (CE) system has attracted much attention because of their ultrafast dynamics aspects. In this research project, I) We have investigated dephasing dynamics of photoexcited state in one-dimesional Mott insulator [Ni(chxn)_2Br]Br_2 by using 2-pulse degenerative four-wave mixing (DFWM), II) ultrafast photoinduced insulator-to metal transition (PIMT) was detected in two-dimensional organic conductor (BEDT-TTF)_2X by mid-IR femtosecond pump-probe spectroscopy for the first time.I)In the DFWM study of [Ni(chxn)_2Br]Br_2, i) for strong excitation condition, the slower decay component (6 ps) of DFWM signal appears, while only sub-ps component is observable for the weak excitation. ii) A temperature dependence of the slow decay for the strong excitation can not be understood in terms of the holon-doublon (h-d) cluster-optical phonon interaction. The temperature dependence of the dynamics can be summarized as follows; a) sub-ps component, which is detected fo … More r T>30 K and becomes shorter for T<100 K, b) several ps component which becomes shorter for T >100 K. The relaxation process of b) can be explained by using the interaction between the carrier and the optical phonon. Nevertheless, the a) is suggested to be related to the magnon excitation since the temperature dependence of the decay constants and their fractions resemble the temperature dependence of the magnetic susceptibility. Moreover, for b), although, the frequency of the interacting optical phonon is evaluated to be same as that of for weak excitation limit, coupling constant is smaller for one order of magnitude. These results indicate that 1) h-d cluster, which is generated by the strong excitation, is scattered by phonon and magnon, 2) the coupling constant between the h-d cluster and optical phonon is markedly suppressed, 3) resultantly, decay reflecting the magnon scattering is considered to appear.II)In the research of the two-dimensional organic conductor (BEDT-TTF)_2X, ultrafast and efficient (>100 molecules /photon) photoinduced insulator-to metal transition was observed. The critical slowing down of the photoinduced metallic state and the coherent phonon reflecting the inhomogeneous structure of the photoinduced domain.Our results will provide the useful information for designing the material for ultarfast CE switching devise whose mechanisms are third order optical nonlinearity or photoinduced phase transition, respectively. Less
相关电子(CE)系统的光响应因其超快动力学方面而备受关注,在本研究项目中,我)研究了一维莫特绝缘体[Ni(chxn)_2Br]Br_2中光激发态的相移动力学。通过使用2脉冲退化四波混频(DFWM),II)在二维有机导体中检测到超快光致绝缘体到金属转变(PIMT) (BEDT-TTF)_2X首次通过中红外飞秒泵浦探针光谱。I)在[Ni(chxn)_2Br]Br_2的DFWM研究中,i)对于强激发条件,较慢的衰减分量(6 ps) ) 的 DFWM 信号出现,而对于弱激励,只能观察到亚 ps 分量 ii) 强激励的缓慢衰减的温度依赖性不能用以下形式来理解。完整-双布朗 (h-d) 团簇-光学声子相互作用可概括如下:a) 亚 ps 分量,在 r T>30 K 时检测到,并且在 T<100 时变得更短。 K、b) 几个 ps 分量在 T >100 K 时变得更短。b) 的弛豫过程可以通过使用载流子和光学声子之间的相互作用来解释。然而,a) 被认为与磁振子激发,因为衰变常数及其分数的温度依赖性类似于磁化率的温度依赖性此外,对于b),光学声子的频率被评估为与弱激发极限耦合的频率相同。常数小了一个数量级,这表明1)由强激发产生的h-d簇被声子和磁振子散射,2)h-d簇与光学之间的耦合常数。声子被明显抑制,3)由此认为出现了反映磁振子散射的衰变。II)在二维有机导体(BEDT-TTF)_2X的研究中,超快高效(>100分子/光子)光致绝缘体观察到光致金属态的临界减慢和反映光致域不均匀结构的相干声子。我们的结果将为设计提供有用的信息。用于超快CE开关器件的材料,其机制分别是三阶光学非线性或光致相变。

项目成果

期刊论文数量(22)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Photoinduced melting of a stripe-type charge-order and metallic domain formation in a layered BEDT-TTF-based organic salt
  • DOI:
    10.1103/physrevlett.98.097402
  • 发表时间:
    2007-03-02
  • 期刊:
  • 影响因子:
    8.6
  • 作者:
    Iwai, S.;Yamamoto, K.;Nishio, Y.
  • 通讯作者:
    Nishio, Y.
光媒体および光素子
光学介质和光学元件
  • DOI:
  • 发表时间:
    2005
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
Coherent control of charge and lattice dynamics in a photoinduced neutral-to-ionic transition of charge-transfer compound
电荷转移化合物光诱导中性到离子转变中电荷和晶格动力学的相干控制
  • DOI:
  • 发表时间:
    2006
  • 期刊:
  • 影响因子:
    0
  • 作者:
    M.Fujiwara;A.I.Titov;T.Kawabata et al.;M.Uchida et al.;S.Nakayama et al.;S.Iwai;S.Iwai;S.Iwai
  • 通讯作者:
    S.Iwai
Ultrafast Phase Control in One-Dimensional Correlated Electron Systems
一维相关电子系统中的超快相位控制
Photoinduced phase transtion in tetrathiafulvalene-p-chloranil(TTf-CA) observed in femtosecond reflection spectroscopy
飞秒反射光谱观察到四硫富瓦烯-对四氯苯醌(TTf-CA)的光致相变
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    M.Fujiwara;A.I.Titov;T.Kawabata et al.;M.Uchida et al.;S.Nakayama et al.;S.Iwai;S.Iwai;S.Iwai;Shinichiro Iwai;S.Iwai;Shinichiro Iwai;S.Iwai;S.Iwai;H.Okamoto;H.Okamoto;S.Iwai;H.Okamoto;H.Okamoto;H.Okamota
  • 通讯作者:
    H.Okamota
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IWAI Shinichiro其他文献

IWAI Shinichiro的其他文献

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{{ truncateString('IWAI Shinichiro', 18)}}的其他基金

Hybrid manipulation of solids by using 6 fs near infrared and teraheltz lights
使用 6 fs 近红外和太赫兹光混合操纵固体
  • 批准号:
    16K13814
  • 财政年份:
    2016
  • 资助金额:
    $ 10.43万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Dynamical localization and photoinduced construction of electronic orders in strongly correlated system
强相关系统中电子指令的动态定位和光诱导构建
  • 批准号:
    15H02100
  • 财政年份:
    2015
  • 资助金额:
    $ 10.43万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Ultrafast Coherent controlof electro-lattice by 10 fs infrared pulse
10 fs红外脉冲对电晶格的超快相干控制
  • 批准号:
    23244062
  • 财政年份:
    2011
  • 资助金额:
    $ 10.43万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Optical control of conductivity as studied by ultrafast terahertz spectroscopy
超快太赫兹光谱研究的电导率光学控制
  • 批准号:
    20340069
  • 财政年份:
    2008
  • 资助金额:
    $ 10.43万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)

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