Observation of second sound in a rapidly varying temperature field in Ge

Albert Beardo, Miquel Lopez-Suarez, Luis Alberto Perez, Lluc Sendra, Maria Isabel Alonso, Claudio Melis, Javier Bafaluy, Juan Camacho, Luciano Colombo, Riccardo Rurali, Francesc Xavier Alvarez, Juan Sebastian Reparaz*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)

Abstract

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. High-frequency second sound is demonstrated in bulk natural Ge between 7 K and room temperature by studying the phase lag of the thermal response under a harmonic high-frequency external thermal excitation and addressing the relaxation time and the propagation velocity of the heat waves. These results provide a route to investigate the potential of wave-like heat transport in almost any material, opening opportunities to control heat through its oscillatory nature.

Original languageEnglish
Article number4677
Number of pages6
JournalScience advances
Volume7
Issue number27
DOIs
Publication statusPublished - Jun 2021

Keywords

  • GERMANIUM
  • SEMICONDUCTORS
  • SCATTERING
  • EQUATION
  • HOLES

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