LaAlO3薄膜经红外活性声子共振驱动的皮秒级膨胀
材料科学
2024-12-24 v1
摘要
我们研究了LaAlO3薄膜在20 THz短脉冲红外激光驱动下的超快结构动力学。时间分辨X射线衍射揭示了薄膜的瞬时晶格膨胀和声学呼吸模。第一性原理理论和弹簧质量模型识别了介导于声子-应变耦合的直接机制。时间分辨光学双折射测量确认，该声学模的�幅随泡浆强度线性比例，这与理论一致。此外，时间分辨X射线散射显示，THz激励通过诱导非热结构对称性增加来增强晶体性，这种对称性增加源于预存在的缺陷。这些发现突显了结合时间分辨X射线和光学测量与第一性原理理论这一多模态方法的潜力，以阐明和控制纳米尺度材料中的结构动力学。
引用
@article{arxiv.2412.17192,
title = {Picosecond expansion in LaAlO3 resonantly driven by infrared-active phonons},
author = {Jakob Gollwitzer and Jeffrey Z. Kaaret and Y. Eren Suyolcu and Guru Khalsa and Rylan C. Fernandes and Oleg Gorobtsov and Sören Buchenau and ChanJu You and Jayanti Higgins and Ryan S. Russell and Ziming Shao and Yorick A. Birkhölzer and Takahiro Sato and Matthieu Chollet and Giacomo Coslovich and Mario Brützam and Christo Guguschev and John W. Harter and Ankit S. Disa and Darrell G. Schlom and Nicole A. Benedek and Andrej Singer},
journal= {arXiv preprint arXiv:2412.17192},
year = {2024}
}