论文标题
在GE中的温度迅速变化的温度场中观察第二个声音
Observation of second sound in a rapidly varying temperature field in Ge
论文作者
论文摘要
第二声音被称为热传输状态，其中温度波携带热量。它的实验观察以前仅限于少量材料，通常在较窄的温度窗口中。我们表明，可以通过迅速变化的温度场来驱动系统来克服这些局限性。在7开尔文和室温之间的大量GE中证明了这种效果，研究了在谐波高频外部热激发下热响应的相位滞后，以解决热波的松弛时间和传播速度。这些结果提供了一条新的途径，以研究几乎所有材料中波浪状热传输的潜力，从而开放了通过其振荡性控制热量的机会。
Second sound is known as the thermal transport regime where heat is carried by temperature waves. Its experimental observation was previously restricted to a small number of materials, usually in rather narrow temperature windows. We show that it is possible to overcome these limitations by driving the system with a rapidly varying temperature field. This effect is demonstrated in bulk Ge between 7 kelvin and room temperature, studying the phase lag of the thermal response under a harmonic high frequency external thermal excitation, addressing the relaxation time and the propagation velocity of the heat waves. These results provide a new route to investigate the potential of wave-like heat transport in almost any material, opening opportunities to control heat through its oscillatory nature.
