Two-Dimensional Mott-Hubbard Electrons in an Artificial Honeycomb Lattice

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Science  03 Jun 2011:
Vol. 332, Issue 6034, pp. 1176-1179
DOI: 10.1126/science.1204333

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Artificial crystal lattices can be used to tune repulsive Coulomb interactions between electrons. We trapped electrons, confined as a two-dimensional gas in a gallium arsenide quantum well, in a nanofabricated lattice with honeycomb geometry. We probed the excitation spectrum in a magnetic field, identifying collective modes that emerged 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 Coulomb-driven ground state.

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