ladder

Fotónica y nanotecnología

In this paper we deal with the intimate connection between photonics and nanotechnology. We will briefly review the optical methods to observe and manipulate nanometric particles and describe how one can modify the photonic response of materials by …

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 …

Local origin of photocurrent in semiconductor superlattices

To trace the origin of photocurrent (PC) in semiconductor superlatices, we have studied the PC spectra as a function of the applied electric field in a novel compositionally graded superlattice, where each well produces a separate peak. The sample …

Change in dimensionality of superlattice excitons induced by an electric field

We have observed an electric-field-induced change in the dimensionality of excitons in superlattices, from three to quasi-two dimensions. The exciton binding energy of a (40 Å/(40 Å) GaAs/(GaAl)As superlattice, determined from low-temperature …

Coherence and localization in semiconductor superlattices under electric fields

Using optical techniques, we have demonstrated that the quantum coherence of electron states in GaAs/GaAlAs superlattices under electric fields increases drastically as the period, $D$, and the electric field, $\cal{E}$, decrease, reaching at least …

Interactions between extended and localized states in superlattices

We have observed electric-field-induced interactions between the extended states of a (40 Å)-(15 Å) GaAs-Ga0.65Al0.35As superlattice and the localized state of an 80-Å terminating GaAs well. At fields such that the energy of an extended state was …

Temperature Dependence of the Electronic Coherence of GaAs-GaAlAs Superlattices

We have shown that the coherence length of electrons in a 55-Å-period GaAs-GaAlAs superlattice does not depend strongly on temperature in the range 5--292 K, varying from 17 periods at 5 K to a minimum of nine periods at room temperature. The quantum …

Optical properties of quantum wells and superlattices under electric fields

We review the effects of a longitudinal electric field on the optical properties of semiconductor quantum wells and superlattices, emphasizing recent developments on the latter, such as the observation of the Stark ladder, field-induced localization, …

Doubly Resonant Raman Scattering Induced by an Electric Field

*Phys. Rev. B* **38**, 12720--12723 (1988)

Stark Localization in GaAs-GaAlAs Superlattices under an Electric Field

*Phys. Rev. Lett.* **60**, 2426--2429 (1988)