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The explanation of the oscillations appearing at large defocus in the V(z) curves of thin specimens is given for isotropic and cubic materials. Using a ray model it is shown that oscillations are generated by the interference of the normal ray with the shear ray reflected from the bottom surface along a symmetrical path to the lens. The model predicts that(More)
A time-dependent method that allows the modelling of the flow of electrons in a nanoscale device in the presence of open boundaries is presented. This method is applied to the simplest possible device (one atom attached to two leads) to investigate steady-state conduction, and the variation of the electric current in the presence of a rapidly varying(More)
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