Lattice response of quantum solids to an impulsive local perturbation -: art. no. 015301

被引:19
作者
Bonacina, L [1 ]
Larrégaray, P [1 ]
van Mourik, F [1 ]
Chergui, M [1 ]
机构
[1] Ecole Polytech Fed Lausanne, ISIC, FSB BSP, Lab Spect Ultrarapide, CH-1015 Lausanne, Switzerland
关键词
D O I
10.1103/PhysRevLett.95.015301
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The lattice response of solid para-H-2 to an impulsive electronic excitation was studied using femtosecond pump-probe spectroscopy. The evolution of an electronic bubble in the crystal, created upon excitation of the A(3s sigma) Rydberg state of an NO impurity, was followed in real time, with a resolution of 100 fs. The experimental results, interpreted in connection with molecular dynamics simulations with quantum corrections, indicate the presence of three stages in the dynamics: a sub-100 fs "adiabatic" phase, a 0.5-1 ps phase, corresponding to the interaction of the first with the next shells driven by the bubble expansion, and a 5 ps phase, corresponding to a slow rearrangement of the environment surrounding the impurity. These findings indicate that the lattice response in solid para-H-2 resembles that of a liquid.
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页数:4
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