Magnetic Field Effect on the Excitation Spectrum of a Neutral Exciton in a Single Quantum Dot

Abstract

Magnetic Field E ect on the Excitation Spectrum of a Neutral Exciton in a Single Quantum Dot M.R. Molas, A.A.L. Nicolet, B. Pi¦tka, A. Babi«ski and M. Potemski Faculty of Physics, University of Warsaw, L. Pasteura 5, 02-093 Warszawa, Poland Laboratoire National des Champs Magnetiques Intenses, CNRS-UJF-UPS-INSA, 25, av. des Martyrs, 38042 Grenoble, France Excitation-energy-dependent magnetospectroscopic measurements of a single GaAlAs/AlAs quantum dot were performed. A signi cant e ect of the excitation energy on the photoluminescence spectra is reported. The photoluminescence excitation spectroscopy has been used to investigate the excitation spectrum of a single electron hole pair a neutral exciton in magnetic eld up to 14 T. The observed resonances exhibit diamagnetic shift characteristic of an s-shell related emission. In our opinion, the creation of excited complexes involving an excited hole and a ground electron is responsible for the process.