Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-06-16
Science 332, 1176 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 10 figures
Scientific paper
10.1126/science.1204333
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.
Gibertini Marco
Karmakar Biswajit
Katsnelson Mikhail I.
Pellegrini Vincenzo
Pfeiffer Loren N.
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