Diamagnetic and paramagnetic shifts in self-assembled InAs lateral quantum dot molecules
Date
2015-05-19
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
Abstract
We uncover the underlying physics that explains the energy shifts of discrete states of individual InAs lateral
quantum dot molecules (LQDMs) as a function of magnetic fields applied in the Faraday geometry. We observe
that ground states of the LQDM exhibit a diamagnetic shift while excited states exhibit a paramagnetic shift.
We explain the physical origin of the transition between these two behaviors by analyzing the molecular exciton
states with effective mass calculations. We find that charge carriers in delocalized molecular states can become
localized in single QDs with increasing magnetic field. We further show that the net effects of broken symmetry
of the molecule and Coulomb correlation lead to the paramagnetic response.
Description
Publisher's PDF
Keywords
Citation
Zhou, Xinran, et al. "Diamagnetic and paramagnetic shifts in self-assembled InAs lateral quantum dot molecules." Physical Review B 91.20 (2015): 205427.