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(Color online) Schematic of a chemical turnstile. In (a) atoms diffuse from the source into the trapping plane. In (b) the trapping plane is reoriented and the atoms allowed to diffuse out into the host material.
Geometry used in Eqs. (1) and (2). The lines AD and CB show the permissible twin wall orientations in the bulk material.
(Color online) Wall trajectories under different bending stresses. In (a) there is no bending stress, in (b) a small bending stress has been applied, and in (c) the bending stress is larger than the critical value.
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