Separated Electron-Phonon and Phonon-Phonon Scatterings Across Interface in Thin Film LaCoO(3) /SrTiO(3).
Separated Electron-Phonon and Phonon-Phonon Scatterings Across Interface in Thin Film LaCoO(3) /SrTiO(3).
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DOI：
10.1002/advs.202305900
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发表时间：
2024-01
期刊：
影响因子：
15.1
通讯作者：
Zhao, Jimin
中科院分区：
文献类型：
--
作者：
Hao, Wenjie;Gu, Minghui;Tian, Zhenyun;Fu, Shaohua;Meng, Meng;Zhang, Hong;Guo, Jiandong;Zhao, Jimin
关键词：
电子-声子耦合（EPC）和声子-声子散射（PPS）是大量子材料微观物理机制的核心。然而，到目前为止，很少有报道说，这两个过程可以在空间上分开，虽然它们通常是时间上分离的不同特征的寿命。在这里，通过使用超快光谱来研究（100）SrTiO 3衬底上的LaCoO 3薄膜中的光载流子超快动力学，发现了有趣的证据，即这两种相互作用确实在空间上分离。EPC主要发生在薄膜中，而PPS主要发生在衬底中，特别是在界面附近的几个原子层中。因此，自然发生光学声子到声学声子的跨界面渗透和衰减。还获得了EPC强度λEg = 0.30，并观察到了45.3GHz的声学声子模。这一发现为未来的量子纳米器件设计奠定了基石。电子-声子耦合（EPC）和声子-声子散射（PPS）是大量子材料微观物理机制的核心。在这里，空间分离的EPC和PPS的证据是通过使用超快光谱上生长在SrTiO 3衬底上的40 nm LaCoO 3薄膜。EPC主要发生在薄膜中，PPS主要发生在衬底中，特别是在界面附近的几个原子层中。
Electron–phonon coupling (EPC) and phonon–phonon scattering (PPS) are at the core of the microscopic physics mechanisms of vast quantum materials. However, to date, there are rarely reports that these two processes can be spatially separated, although they are usually temporally detached with different characteristic lifetimes. Here, by employing ultrafast spectroscopy to investigate the photo‐carrier ultrafast dynamics in a LaCoO3 thin film on a (100) SrTiO3 substrate, intriguing evidence is found that the two interactions are indeed spatially separated. The EPC mainly occurs in the thin film, whereas PPS is largely in the substrate, especially at the several atomic layers near the interface. Across‐interface penetration and decay of optical phonons into acoustic phonons thus naturally occur. An EPC strength λEg = 0.30 is also obtained and an acoustic phonon mode at 45.3 GHz is observed. The finding lays out a cornerstone for future quantum nano device designs. Electron–phonon coupling (EPC) and phonon‐phonon scattering (PPS) are at the core of the microscopic physics mechanisms of vast quantum materials. Here, evidence of spatially separated EPC and PPS is unveiled by using ultrafast spectroscopy on a 40 nm LaCoO3 thin films grown on SrTiO3 substrate. The EPC mainly occurs in thin film and the PPS occurs largely in the substrate, especially at the several atomic layers in the substrate nearby the interface.
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