期刊
PHYSICAL REVIEW LETTERS
卷 101, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.135701
关键词
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资金
- BMBF [FSP301-FLASH, FKZ:05KS7SJ1]
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1134]
- European Community Research Training Network [MRTN-CT-2003503641]
We compute the potential energy surface of femtosecond-laser-excited InSb along the directions in which the crystal becomes soft. Using dynamical simulations the time dependence of the atomic coordinates is obtained. We find that at high excitation densities the anharmonicity of the potential energy surface becomes significant after similar to 100 fs. On the basis of our results we explain recent time-resolved x-ray diffraction experiments. We point out that an alternative model for ultrafast melting [A. M. Lindenberg et al., Science 308, 392 (2005)] is inconsistent with our calculations.
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