期刊
SCIENCE
卷 364, 期 6438, 页码 375-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aav3548
关键词
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资金
- Office of Naval Research under MURI grant [N00014-16-1-2436]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001299]
- NSF EFRI 2-DARE grant [EFMA-1542864]
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.
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