Donor impurity-related linear and nonlinear intraband optical absorption coefficients in quantum ring : effects of applied electric field and hydrostatic pressure

ABSTRACT: The linear and nonlinear intraband optical absorption coefficients in GaAs three-dimensional single quantum rings are investigated. Taking into account the combined effects of hydrostatic pressure and electric field, applied along the growth direction of the heterostructure, the energies of the ground and first excited states of a donor impurity have been found using the effective mass approximation and a variational method. The energies of these states are examined as functions of the dimensions of the structure, electric field, and hydrostatic pressure. We have also investigated the dependencies of the linear, nonlinear, and total optical absorption coefficients as a function of incident photon energy for several configurations of the system. It is found that the variation of distinct sizes of the structure leads to either a redshift and/or a blueshift of the resonant peaks of the intraband optical spectrum. In Maddition, we have found that the application of an electric field leads to a redshift, whereas the influence of hydrostatic pressure leads to a blueshift (in the case of on-ring-center donor impurity position) of the resonant peaks of the intraband optical spectrum.

• Autores: Duque Echeverri, Carlos Alberto; Morales Aramburo, Álvaro Luis; Montes Barahona, Augusto León; Barseghyan, Manuk G.; Restrepo Arango, Ricardo León; Mora Ramos, Miguel Eduardo
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2012
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: eng
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/8374
• Acceso en línea: http://hdl.handle.net/10495/8374
• Palabra clave: Espectros de absorción; Absorption spectra; Absorción de ondas electromagnéticas; Electromagnetic wave absorption; Campo eléctrico; Electric field; http://aims.fao.org/aos/agrovoc/c_33981; http://aims.fao.org/aos/agrovoc/c_33981
• Rights: openAccess
• License: Atribución 2.5 Colombia (CC BY 2.5 CO)