Real-space mapping of exciton wave function in a GaAs quantum dot by near-field optical imaging spectroscopy

• Published in: Physica Status Solidi (b) 2003-07, Vol.238 (2), p.285-288
• Main Authors: Matsuda, Kazunari, Saiki, Toshiharu, Nomura, Shintaro, Mihara, Masaru, Aoyagi, Yoshinobu
• Format: Article
• Language: English
• Subjects: 71.35.Cc; 78.55.Cr; 78.67.Hc; Collective excitations (including excitons, polarons, plasmons and other charge-density excitations); Collective excitations (including plasmons and other charge-density excitations); Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Exact sciences and technology; Physics; Quantum dots; Surface and interface electron states
• ISSN: 0370-1972; 1521-3951
• DOI: 10.1002/pssb.200303039

We describe near‐field photoluminescence imaging spectroscopy of a single naturally occurring GaAs quantum dot in a narrow quantum well. A spatial mapping of the center‐of‐mass wave function of the exciton state in the quantum dot is demonstrated due to the realization of a high spatial resolution (30 nm) of imaging spectroscopy and the selection of a large quantum dot (100 nm). We observe an elongation along the [110] crystal axis of the wave function in the exciton state.