Observation of Berry's Geometrical Phase in Electron Diffraction from a Screw Dislocation
- 19 December 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 61 (25) , 2863-2866
- https://doi.org/10.1103/physrevlett.61.2863
Abstract
The equations which govern high-energy electron diffraction in a deformed crystal lattice are shown to be equivalent to a Schrödinger equation with a time-dependent Hamiltonian. If the lattice planes are not strongly distorted, as in the long-ranged strain field of a dislocation, this time variation is slow and adiabatic theory can be used. The effects of Berry's geometrical phase are then observed in the bending of two-beam diffraction fringes as a screw dislocation is crossed.Keywords
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