Dynamical Diffraction Theory for Wave Packet Propagation in Deformed Crystals
Kei Sawada, Shuichi Murakami, Naoto Nagaosa
Abstract
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 ω/Δω (ω: frequency of an x ray, Δω: gap frequency induced by the Bragg reflection). Comparison with the conventional dynamical diffraction theory is also made.
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