Strong light-field effects driven by nearly single-cycle 7fs light-field in correlated organic conductors
Strong light-field effects driven by nearly single-cycle 7fs light-field in correlated organic conductors
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相关有机导体中近单周期 7fs 光场驱动的强光场效应
DOI：
10.1088/1361-6455/aad40a
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
and S. Iwai
中科院分区：
文献类型：
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作者：
Y. Kawakami;H. Itoh;K. Yonemitsu;and S. Iwai
在相关的有机导体中，我们展示了驱动高频场为7飞秒，1.5周的近红外光的暂态电荷局域效应。在层状有机导体α-(BEDT-TTf)2 I3(BEDT-TTf：双[乙撑二硫]-四硫富瓦烯)中，在金属相中诱导出瞬时短程电荷有序(CO)态。与α-(BEDT-TTf)2I3中电子状态从金属到瞬时CO的剧烈变化不同，在准一维有机导体(TMTTf)2AsF6(TMTTf：四甲基四硫富瓦烯)中，场诱导转移积分降低的动力学被捕获为类等离子体反射边的红移。这些对场诱导电荷局域化的研究是基于强连续场下无电子关联的紧束缚模型的动态局域化理论。然而，用近单周期的7fs，11 mV cm−-1脉冲的抽运-探测瞬时反射率的测量结果和理论研究表明，脉冲场通过其特有的晶格结构和库仑排斥来促成类似的现象。
We have demonstrated transient charge localization effects with a driving high-frequency field of 7 fs, 1.5-cycle near-infrared light in correlated organic conductors. In a layered organic conductor α-(BEDT-TTF) 2 I 3 (BEDT-TTF: bis [ethylenedithio]-tetrathiafulvalene), a transient short-range charge order (CO) state is induced in a metallic phase. In contrast to such drastic change in the electronic state from the metal to the transient CO in α-(BEDT-TTF) 2 I 3, dynamics of a field-induced reduction of a transfer integral are captured as a red-shift of the plasma-like reflectivity edge in a quasi-one-dimensional organic conductor (TMTTF) 2 AsF 6 (TMTTF: tetramethyltetrathiafulvalene). These studies on the field-induced charge localization have been motivated by the theory of dynamical localization on the basis of tight-binding models with no electron correlation under a strong continuous field. However, the results of pump–probe transient reflectivity measurements using nearly single-cycle 7 fs, 11 MV cm− 1 pulses and the theoretical studies which are presented in this review indicate that the pulsed field contributes to the similar phenomenon with the help of a characteristic lattice structure and Coulomb repulsion.