Photoinduced changes in the cuprate electronic structure revealed by femtosecond time- and angle-resolved photoemission
Photoinduced changes in the cuprate electronic structure revealed by femtosecond time- and angle-resolved photoemission
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DOI：
10.1103/physrevb.89.115115
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发表时间：
2014-03-13
影响因子：
3.7
通讯作者：
Bovensiepen, U.
中科院分区：
文献类型：
--
作者：
Rameau, J. D.;Freutel, S.;Bovensiepen, U.
通过飞秒激光脉冲驱动的电子结构 E(k) 的变化来研究固体中准粒子的修整。在高于 T-c 的最佳掺杂铜酸盐上采用时间和角度分辨光电发射，我们观察到具有不同特征时间演化的两种效应，因此具有不同的微观起源。首先，在实验的 100-fs 时间分辨率期间，发现由于 E(k) 中的 70-meV 扭结而导致有效质量发生显着变化，并将其归因于激光驱动的裸带电子相互作用的扰动。其次，k(F) 的变化可以通过粒子空穴不对称性导致的有效光电掺杂来解释，并为基于光驱动绝缘体-超导体转变的超快光电开关提供了机会。
The dressing of quasiparticles in solids is investigated by changes in the electronic structure E(k) driven by femtosecond laser pulses. Employing time-and angle-resolved photoemission on an optimally doped cuprate above T-c, we observe two effects with different characteristic temporal evolutions and, therefore, different microscopic origins. First, a marked change in the effective mass due to the 70-meV kink in E(k) is found to occur during the experiment's 100-fs temporal resolution and is assigned to laser-driven perturbation of an electronic interaction dressing the bare band. Second, a change in k(F) is explained by effective photodoping due to particle-hole asymmetry and offers opportunities for ultrafast optoelectronic switches based on an optically driven insulator-superconductor transition.