Ge 中快速变化温度场下第二声的观测
材料科学
2021-01-11 v3 经典物理
摘要
第二声被称为热由温度波携带的热传输机制。其实验观测此前仅限于少数材料，且通常在相当窄的温度窗口内。我们表明，可通过以快速变化温度场驱动系统来克服这些限制。该效应在块体 Ge 中于 7 开尔文至室温间得以展示，研究了在谐波高频外部热激发下热响应的相位滞后，探讨了热波的弛豫时间与传播速度。这些结果提供了一条新途径，用以探究几乎任意材料中波动式热传输的潜力，通过热的振荡性质控制热开辟了机遇。
引用
@article{arxiv.2007.05487,
title = {Observation of second sound in a rapidly varying temperature field in Ge},
author = {Albert Beardo and Miquel López-Suárez and Luis Alberto Pérez and Lluc Sendra and Maria Isabel Alonso and Claudio Melis and Javier Bafaluy and Juan Camacho and Luciano Colombo and Riccardo Rurali and F. X. Alvarez and Juan Sebastián Reparaz},
journal= {arXiv preprint arXiv:2007.05487},
year = {2021}
}
备注
After careful revision we have ruled out the presence of coherent noise and from any other noise source within the reported data. We have updated the manuscript providing a detailed analysis of the photoreflectance signal, demonstrating with experiments its thermal origin