semiconductor

Semiconductores con Luz Propia

Wannier-Stark localization and Bloch oscillations

This chapter discusses the effects of an electric field on the electronic and optical properties of semiconductor superlattices. Here an ideal superlattice is considered to be an infinite periodic series of strongly coupled quantum wells. The …

Quantum coherence in semiconductor superlattices

Using photocurrent spectroscopy, we have demonstrated that the quantum coherence in GaAs-Ga$_{1-x}$Al$_x$As superlattices increases with decreasing superlattice period $D$, and that it is maintained for at least eight periods when $D = 60$ angstroms. …

Doubly Resonant Raman Scattering Induced by an Electric Field

By applying a variable electric field to a 30-35 Å GaAs/Ga$_{0.65}$Al$_{0.35}$As superlattice we have achieved tunable doubly resonant Raman processes, in which both the incident and the scattered light are in resonance with electronic transitions. …

Stark Localization in GaAs-GaAlAs Superlattices under an Electric Field

We have observed that a strong electric field E shifts to higher energies the photoluminescence and photocurrent peaks of a GaAs-Ga0.65Al0.35As superlattice of period D (=65 Å), which we explain by a field-induced localization of carriers to isolated …