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Laser ablation is often explained by a two-temperature model (TTM) withdifferent electron and lattice temperatures. To realize a classical moleculardynamics simulation of the TTM, we propose an extension of the embedded atommethod to construct an interatomic potential that is dependent on the electrontemperature. This method is applied to copper, and its validity is demonstratedby comparison of several physical properties, such as the energy-volume curve,phonon dispersion, electronic heat capacity, ablation threshold, and meansquare displacement of atoms, with those of finite-temperature densityfunctional theory.

Development of the temperature-dependent interatomic potential for molecular dynamics simulation of metal irradiated with an ultrashort pulse laser