期刊
APPLIED PHYSICS LETTERS
卷 96, 期 16, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3402773
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-
资金
- DFG [BA 2281/3-1, 762]
We experimentally demonstrate efficient switching of the hard x-ray Bragg reflectivity of a SrRuO(3) /SrTiO(3) superlattice by optical excitation of large-amplitude coherent acoustic superlattice phonons. The rocking curve changes drastically on a 1 ps timescale. The (0 0 116) reflection is almost extinguished (Delta R/R(0)=-0.91), while the (0 0 118) reflection increases by more than an order of magnitude (Delta R/R(0)=24.1). The change of the x-ray structure factor depends nonlinearly on the phonon amplitude, allowing manipulation of the x-ray response on a timescale considerably shorter than the phonon period. Numerical simulations for a superlattice with slightly changed geometry and realistic parameters predict a switching-contrast ratio Delta R/R(0) of 700 with high reflectivity. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3402773]
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