Anomalous electric-field dependence of excitonic Fano-resonance spectra in semiconductor quantum-wells

• Published in: Solid state communications Vol. 128; no. 1; pp. 9 - 13
• Main Author: Hino, Ken-ichi
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.10.2003; Elsevier
• Subjects: A. Quantum wells; A. Semiconductors; Condensed matter: electronic structure, electrical, magnetic, and optical properties; D. Optical properties; Electron states; Exact sciences and technology; Level splitting and interactions; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures; Physics; Quantum wells; Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect; Spin-orbit coupling, zeeman, stark, and strain splitting, jahn-teller effect; 71.35.−y; 32.80.Dz; A. Quantum wells; 73.21.−b; D. Optical properties; A. Semiconductors; Fano effect; External fields; Semiconductor materials; Bound state; Quantum wells; Theoretical study; Quantum effect; Stark effect; Subband; Multiple scattering; 73.21; Excitons; b; 71.35; Electric field effects; Anomaly; Absorption spectra; y: 32.80.Dz A. Semiconductors; A. Quantum wells; D. Optical properties
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/S0038-1098(03)00622-7

Optical absorption spectra due to Fano resonance (FR) of an exciton in a quantum well with an external electric field perpendicular to the layer plane are presented, based on multi-channel scattering calculations incorporating a hole-subband mixing effect. Peak values of the calculated FR spectra exhibit anomalous field-dependent changes. These cannot be accounted for by the commonly-known quantum-confined Stark effect (QCSE) that has been applied exclusively to bound state spectra. This behavior, ascribable to correlation between Fano couplings and the QCSE, is revealed just in high-resolution spectra, otherwise the field-dependence results in nothing but the same as that of the bound-state spectra.