Abstract
The electron phase coherence length xi determines the size regime where a three-dimensional (3D) confinement becomes an electron resonator. xi may become as large as some mu m in mesoscopic metal and semiconductor crystals if inelastic scattering is strongly suppressed. Depending on the confinement size, electrons exhibit either more wave or more corpuscular character. This was recently observed in isolated metal particles as well as in silicon inversion-layer nanostructures. The experimental results favour Einstein's arguments against those of Bohr in the famous dispute as to whether such a wave-corpuscle transition is sharp or not.
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