Impurity-Related Nonlinear Optical Absorption in Delta-Doped Quantum Rings

ABSTRACT: Using a variational procedure within the e ective mass approximation, we have calculated the hydrogenic impurity binding energy as well as the impurity-related nonlinear optical absorption in a single quantum ring with axial n-type delta-doping. The delta-like potential along the z-direction is analytically modeled with a Hartree-like con ning pro le tted to a one-dimensional Thomas Fermi-based potential in the local density approximation. Both on-center and on-edge impurity positions are considered and the energies of the impurity states are examined as functions of the vertical size of the ring. It is found that the e ect of changes in the geometry of the quantum ring leads to a shifting of the resonant peaks of the intra-band optical spectrum.

• Autores: Restrepo Arango, Ricardo León; Martínez Orozco, Juan Carlos; Barseghyan, Manuk; Mora Ramos, Miguel Eduardo; Duque Echeverri, Carlos Alberto
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2014
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: eng
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/20817
• Acceso en línea: http://hdl.handle.net/10495/20817
• Palabra clave: Absorción de ondas electromagnéticas; Electromagnetic wave absorption; Rayos delta; Delta rays; Semiconductores; Semiconductors; Anillos cuánticos; Absorción óptica; Óptica no lineal
• Rights: openAccess
• License: http://creativecommons.org/licenses/by-nc-nd/2.5/co/