Dynamical Diffraction Theory for Wave Packet Propagation in Deformed Crystals

Details Dynamical Diffraction Theory for Wave Packet Propagation in Deformed Crystals Dynamical Diffraction Theory for Wave Packet Propagation in Deformed Crystals

2006-01-31

arxiv.org/abs/cond-mat/0602001v2

Phys. Rev. Lett. 96, 154802 (2006)

Physics

Condensed Matter

Materials Science

4 pages, 2 figures. Title changed

Scientific paper

10.1103/PhysRevLett.96.154802

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 $\omega /\Delta \omega$ ($\omega$: frequency of an x ray, $\Delta\omega$: gap frequency induced by the Bragg reflection). Comparison with the conventional dynamical diffraction theory is also made.

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