论文标题
纯属金属异质结构中的语音主导的能量传输
Phonon-dominated energy transport in purely metallic heterostructures
论文作者
论文摘要
我们使用Ultrafast X射线衍射来量化激光激发的Nanoscale au/ni Bilayers中能量的运输。 Ni中的电子传输和有效的电子偶联将几次picseconds中的传导电子中的激光沉积能转换为双层界面的热Ni和冷AU声子之间的强非平衡。在各种两个温度模型中随后的平衡动力学的建模证实，对于超薄au膜，热传输由声子主导，而不是传导电子，因为Au中的电子音波耦合弱。
We use ultrafast x-ray diffraction to quantify the transport of energy in laser-excited nanoscale Au/Ni bilayers. Electron transport and efficient electron-phonon coupling in Ni convert the laser-deposited energy in the conduction electrons within a few picoseconds into a strong non-equilibrium between hot Ni and cold Au phonons at the bilayer interface. Modeling of the subsequent equilibration dynamics within various two-temperature models confirms that for ultrathin Au films the thermal transport is dominated by phonons instead of conduction electrons because of the weak electron-phonon coupling in Au.
