Dynamical diffraction theory for wave packet propagation in deformed crystals.
Dynamical diffraction theory for wave packet propagation in deformed crystals.
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DOI：
10.1103/physrevlett.96.154802
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发表时间：
2006-01
影响因子：
8.6
通讯作者：
K. Sawada;S. Murakami;N. Nagaosa
中科院分区：
文献类型：
--
作者：
K. Sawada;S. Murakami;N. Nagaosa
我们发展了一个理论，在晶体变形的存在下的X射线的轨迹。本文导出了一组包含动态衍射的X射线波包的运动方程，并将Berry相位作为几何光学的修正。由于晶体变形，波包的轨迹具有中心位置的偏移。值得注意的是，在布拉格条件附近，位移被增强了一个因子Ω/Δ Ω（Ω：X射线的频率，Δ Ω：布拉格反射引起的间隙频率）。并与传统的动力学衍射理论作了比较。
We develop a theory for the trajectory of an x ray in the presence of a crystal deformation. A set of equations of motion for an x-ray wave packet including the dynamical diffraction is derived, taking into account the Berry phase as a correction to geometrical optics. The trajectory of the wave packet has a shift of the center position due to a crystal deformation. Remarkably, in the vicinity of the Bragg condition, the shift is enhanced by a factor omega/deltaomega (omega: frequency of an x ray, deltaomega: gap frequency induced by the Bragg reflection). Comparison with the conventional dynamical diffraction theory is also made.