Graduate Thesis Or Dissertation
 

Collective electron behavior in electron-hole superlattices

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  • Unusual plasmas consisting of periodic layers of spatially separated electrons and holes can be fabricated by molecular beam epitaxial techniques. These materials are referred to as type II superlattices but also include the class of doping superlattices called n-i-p-i lattices. Layer thickness can be controlled to the order of 10 - 100 times atomic dimensions so that quantum mechanical effects result in quasi one-dimensional electronic aubbands in the direction perpendicular to the layers. Inter and intralayer coulomb interactions create plasma modes with acoustic dispersion which may be observed by inelastic light scattering (Raman effect). Plasmon dispersion relations for some typical structures are calculated taking into account the finite thickness and finite separation of the plasma layers.
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