ACTA

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

M.R. Molas^a,b, A.A.L. Nicolet^b, B. Piętka^a, A. Babiński^a and M. Potemski^b
^aFaculty of Physics, University of Warsaw, L. Pasteura 5, 02-093 Warszawa, Poland
^bLaboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 25, av. des Martyrs, 38042 Grenoble, France

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Excitation-energy-dependent magnetospectroscopic measurements of a single GaAlAs/AlAs quantum dot were performed. A significant effect 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 field 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.

DOI: 10.12693/APhysPolA.126.1066
PACS numbers: 78.67.Hc, 71.35.-y, 78.55.Cr