Observation of second sound in a rapidly varying temperature field in Ge
| Autor: | Beardo, Albert, López-Suárez, Miquel, Pérez, Luis Alberto, Sendra, Lluc, Alonso, Maria Isabel, Melis, Claudio, Bafaluy, Javier, Camacho, Juan, Colombo, Luciano, Rurali, Riccardo, Alvarez, F. X., Reparaz, Juan Sebastián |
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| Rok vydání: | 2020 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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. Comment: 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 |
| Databáze: | arXiv |
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