Separated Electron–Phonon and Phonon–Phonon Scatterings Across Interface in Thin Film LaCoO3/SrTiO3,Advanced Science

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Separated Electron–Phonon and Phonon–Phonon Scatterings Across Interface in Thin Film LaCoO3/SrTiO3
Advanced Science ( IF 14.3 ) Pub Date : 2023-11-20 , DOI: 10.1002/advs.202305900
Wenjie Hao _{1,

2} , Minghui Gu _{2,

3} , Zhenyun Tian ₂ , Shaohua Fu ₂ , Meng Meng _{2,

3} , Hong Zhang ₁ , Jiandong Guo _{2,

3} , Jimin Zhao _{2,

3,

4}

Affiliation

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 λ_Eg = 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.

中文翻译：

薄膜 LaCoO3/SrTiO3 中界面上的分离电子-声子和声子-声子散射

电子-声子耦合（EPC）和声子-声子散射（PPS）是大量量子材料微观物理机制的核心。然而，迄今为止，很少有报道表明这两个过程可以在空间上分离，尽管它们通常在时间上分离且具有不同的特征寿命。在这里，通过采用超快光谱研究 (100) SrTiO ₃基板上的 LaCoO ₃薄膜中的光载流子超快动力学，发现了有趣的证据，表明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主要发生在基板中，特别是在界面附近的几个原子层中。因此，光学声子跨界面渗透和衰减到声学声子中自然发生。还获得了 EPC 强度λ _Eg = 0.30，并观察到 45.3 GHz 的声子模式。这一发现为未来的量子纳米器件设计奠定了基石。

更新日期：2023-11-20

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