Two-dimensional Mott-Hubbard electrons in an artificial honeycomb lattice |
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| Authors: | Singha A Gibertini M Karmakar B Yuan S Polini M Vignale G Katsnelson M I Pinczuk A Pfeiffer L N West K W Pellegrini V |
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| Institution: | National Enterprise for nanoScience and nanoTechnology, Istituto Nanoscienze-CNR, and Scuola Normale Superiore, I-56126 Pisa, Italy. |
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| Abstract: | 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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