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Self-learning method for construction of analytical interatomic potentials to describe laser-excited materials
Physical Review Letters ( IF 8.385 ) Pub Date : 
Bernd Bauerhenne, Vladimir P. Lipp, Tobias Zier, Eeuwe S. Zijlstra, and Martin E. Garcia

Large-scale simulations using interatomic potentials provide deep insights in the processes occurring in solids subject to external perturbations. The atomistic description of laser-induced ultrafast nonthermal phenomena, however, constitutes a particularly difficult case and has so far not been possible on experimentally accessible length- and time scales because of two main reasons: (i) ab-initio simulations are restricted to a very small number of atoms and ultrashort times, and (ii) simulations relying on electronic temperature (Te) dependent interatomic potentials do not reach the necessary ab-initio accuracy. Here we develop a self-learning method for constructing Te-dependent interatomic potentials which permit ultra-large scale atomistic simulations of systems suddenly brought to extreme nonthermal states with Density-Functional-Theory (DFT) accuracy. The method always finds the global minimum in the parameter space. We derived a highly accurate analytical Te-dependent interatomic potential, Φ(Te), for silicon (Si), that yields a remarkably good description of laser excited and unexcited Si-bulk and Si-films. Using Φ(Te) we simulate the laser excitation of Si nanoparticles and find strong damping of their breathing modes due to nonthermal melting.
更新日期:2020-01-14

 

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