Two-dimensional Mott-Hubbard electrons in an artificial honeycomb lattice
Strongly Correlated Electrons
2011-06-17 v1 Mesoscale and Nanoscale Physics
Abstract
Electrons in artificial lattices enable explorations of the impact of repulsive Coulomb interactions in a tunable system. We have trapped two-dimensional electrons belonging to a gallium arsenide quantum well in a nanofabricated lattice with honeycomb geometry. We probe the excitation spectrum in a magnetic field identifying novel collective modes that emerge from the Coulomb interaction in the artificial lattice as predicted by the Mott-Hubbard model. These observations allow us to determine the Hubbard gap and suggest the existence of a novel Coulomb-driven ground state. This approach offers new venues for the study of quantum phenomena in a controllable solid-state system.
Keywords
Cite
@article{arxiv.1106.3215,
title = {Two-dimensional Mott-Hubbard electrons in an artificial honeycomb lattice},
author = {A. Singha and M. Gibertini and B. Karmakar and S. Yuan and M. Polini and G. Vignale and M. I. Katsnelson and A. Pinczuk and L. N. Pfeiffer and K. W. West and V. Pellegrini},
journal= {arXiv preprint arXiv:1106.3215},
year = {2011}
}
Comments
10 pages, 10 figures