The many-body state of carriers confined in a quantum dot is controlled by the balance between their kinetic energy and their Coulomb correlation. In coupled quantum dots, both can be tuned by varying the inter-dot tunneling and interactions. Using a theoretical approach based on the diagonalization of the exact Hamiltonian, we show that transitions between different quantum phases can be induced through inter-dot coupling both for a system of few electrons (or holes) and for aggregates of electrons and holes. We discuss their manifestations in addition energy spectra (accessible through capacitance or transport experiments) and optical spectra.
@article{arxiv.cond-mat/0105427,
title = {Quantum phases in artificial molecules},
author = {Massimo Rontani and Filippo Troiani and Ulrich Hohenester and Elisa Molinari},
journal= {arXiv preprint arXiv:cond-mat/0105427},
year = {2009}
}
Comments
29 pages, 8 figures (ps and eps), LaTeX 2e, ELSART package. To appear in Solid State Communications - Special Issue on Spin Effects in Mesoscopic Systems