期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.075002
关键词
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资金
- Department of Energy, Office of Science, Fusion Energy Science [FWP 100182]
- SLAC National Accelerator Laboratory Directed Research and Development Program
- Natural Sciences and Engineering Research Council of Canada
We present a new measurement of lattice disassembly times in femtosecond-laser-heated polycrystalline Au nanofoils. The results are compared with molecular dynamics simulations incorporating a highly optimized, embedded-atom-method interatomic potential. For absorbed energy densities of 0.9-4.3 MJ/kg, the agreement between the experiment and simulation reveals a single-crystal-like behavior of homogeneous melting and corroborates the applicability of the interatomic potential in the nonequilibrium warm dense matter regime. For energy densities below 0.9 MJ/kg, the measurement is consistent with nanocrystal behavior where melting is initiated at the grain boundaries.
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