Unknown

Dataset Information

0

Observation of second sound in graphite over 200 K.


ABSTRACT: Second sound refers to the phenomenon of heat propagation as temperature waves in the phonon hydrodynamic transport regime. We directly observe second sound in graphite at temperatures of over 200 K using a sub-picosecond transient grating technique. The experimentally determined dispersion relation of the thermal-wave velocity increases with decreasing grating period, consistent with first-principles-based solution of the Peierls-Boltzmann transport equation. Through simulation, we reveal this increase as a result of thermal zero sound-the thermal waves due to ballistic phonons. Our experimental findings are well explained with the interplay among three groups of phonons: ballistic, diffusive, and hydrodynamic phonons. Our ab initio calculations further predict a large isotope effect on the properties of thermal waves and the existence of second sound at room temperature in isotopically pure graphite.

SUBMITTER: Ding Z 

PROVIDER: S-EPMC8755757 | biostudies-literature |

REPOSITORIES: biostudies-literature

Similar Datasets

| S-EPMC4123955 | biostudies-literature
| S-EPMC3506979 | biostudies-literature
| S-EPMC8270978 | biostudies-literature
| S-EPMC3767512 | biostudies-literature
| S-EPMC6588561 | biostudies-literature
| S-EPMC3658007 | biostudies-other
| S-EPMC6841952 | biostudies-literature
| S-EPMC4637907 | biostudies-other
| S-EPMC5066364 | biostudies-literature
| S-EPMC6848124 | biostudies-literature