Interatomic Potential in the Nonequilibrium Warm Dense Matter Regime

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/...

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Bibliographic Details
Published in:Physical review letters 2018-08, Vol.121 (7), p.075002-075002, Article 075002
Main Authors: Chen, Z, Mo, M, Soulard, L, Recoules, V, Hering, P, Tsui, Y Y, Glenzer, S H, Ng, A
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Dismantling
Embedded atom method
Grain boundaries
Laser beam heating
Molecular dynamics
Single crystals
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.121.075002