2006/02/28 by Kei Sawada, Shuichi Murakami, Naoto Nagaosa
Physics and Astronomy · #Acousto-optics #Bragg's law #Condensed matter physics #Crystal (programming language) #Crystallography and Radiation Phenomena #Diffraction #Diffraction grating #Dynamical theory of diffraction #Geometric phase #Omega #Optics #Photorefractive and Nonlinear Optics #Physics #Quantum mechanics #Reflection (computer programming) #Topological Materials and Phenomena #Trajectory #Wave packet #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevlett.96.154802
published as Phys. Rev. Lett. 96, 154802 (2006) · 4 pages, 2 figures. Title changed
openalex publication_date 2006/04/21 · arxiv created 2006/04/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.