Open AccessПоляризационная спектроскопия одиночной квантовой точки и одиночной квантовой нити
Author(s) -
В.Н. Кац,
А.В. Платонов,
Г.Э. Цырлин,
A.Д. Буравлев,
A. Delga,
L. Besombes,
H. Mariette,
В.П. Кочерешко
Publication year - 2018
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2018.12.46737.136
Subject(s) - exciton , quantum dot , photoluminescence , binding energy , condensed matter physics , magnetic field , nanowire , spectral line , perpendicular , physics , biexciton , atomic physics , optoelectronics , quantum mechanics , geometry , mathematics
Photoluminescence spectra of an isolated GaAs quantum dot within an AlGaAs quantum wire are studied. The examination of behavior of spectra in a magnetic field provided an opportunity to estimate the exciton binding energy in the quantum dot, which turned out to be 10 times higher than the bulk exciton binding energy in GaAs. It is demonstrated that the signal of exciton photoluminescence from the quantum dot emitted along the nanowire axis is linearly polarized. At the same time, the photoluminescence signal propagating in the direction perpendicular to the nanowire axis is almost unpolarized. This may be attributed to the nonaxial dot positioning in the wire under a giant increase in the binding energy of an exciton affected by an image potential.