Handbook of Thin Films

Handbook of Thin Films

Volume 5, 2002, Pages 169-206
Handbook of Thin Films

Chapter 5 - Quantum well interference in double quantum wells

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Publisher Summary

Among the mechanisms of the interlayer exchange coupling, the quantum well states (QWS) attracted considerable attention. The spin-polarized QWS forms in the layered magnetic nanostructures by the spin-dependent scattering of the electrons at the magnetic/nonmagnetic interfaces. To have a better understanding of the mechanism of the exchange coupling, the quantum well interference (QWI) in double quantum wells (DQWs) needs to be investigated. Several photoemission experiments reveal the interference behaviors of electrons at the Fermi surface. However, it is necessary to carry out theoretical investigations to interpret the experimental data to gain a deeper insight into this phenomenon. It is well known that the energy of electrons moving in a quantum well is quantized according to quantum mechanics. If the electrons move in two or more quantum wells separated by spacers, the quantum well interference among the wells may either be neglected when the thickness of the spacers is thick enough or pronounced when the wells are close enough.

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