Observation of second sound in graphite at temperatures above 100 K

Observation of second sound in graphite at temperatures above 100 K

Wavelike thermal transport in solids, referred to as second sound, is an exotic phenomenon previously limited to a handful of materials at low temperatures. The rare occurrence of this effect restricted its scientific and practical importance. We directly observed second sound in graphite at tempera...

Full description

Bibliographic Details
Main Authors: Huberman, Samuel C., Duncan, Ryan Andrew, Chen, Ke, Song, Bai, Chiloyan, Vazrik, Ding, Zhiwei, Maznev, Alexei, Chen, Gang, Nelson, Keith Adam
Other Authors: Massachusetts Institute of Technology. Department of Mechanical Engineering
Format: Article
Language:English
Published: American Association for the Advancement of Science (AAAS) 2020
Online Access:https://hdl.handle.net/1721.1/123553
Description
Summary:Wavelike thermal transport in solids, referred to as second sound, is an exotic phenomenon previously limited to a handful of materials at low temperatures. The rare occurrence of this effect restricted its scientific and practical importance. We directly observed second sound in graphite at temperatures above 100 kelvins by using time-resolved optical measurements of thermal transport on the micrometer-length scale. Our experimental results are in qualitative agreement with ab initio calculations that predict wavelike phonon hydrodynamics. We believe that these results potentially indicate an important role of second sound in microscale transient heat transport in two-dimensional and layered materials in a wide temperature range.

Similar Items