Shell structure and electron-electron interaction in self-assembled InAs quantum dots
摘要
Using far-infrared spectroscopy, we investigate the excitations of self-organized InAs quantum dots as a function of the electron number per dot, 1<n<6, which is monitored in situ by capacitance spectroscopy. Whereas the well-known two-mode spectrum is observed when the lowest s - states are filled, we find a rich excitation spectrum for n=3, which reflects the importance of electron-electron interaction in the present, strongly non-parabolic confining potential. From capacitance spectroscopy we find that the electronic shell structure in our dots gives rise to a distinct pattern in the charging energies which strongly deviates from the monotonic behavior of the Coulomb blockade found in mesoscopic or metallic structures.
引用
@article{arxiv.cond-mat/9609270,
title = {Shell structure and electron-electron interaction in self-assembled InAs quantum dots},
author = {M. Fricke and A. Lorke and J. P. Kotthaus and G. Medeiros-Ribeiro and P. M. Petroff},
journal= {arXiv preprint arXiv:cond-mat/9609270},
year = {2009}
}
备注
4 pages, 3 PostScript figures