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

• DOI: 10.1126/science.1204333
• Publication Date: 2011-06-03T07:07:02Z
• Authors: A. Singha; M. Gibertini; B. Karmakar; S. Yuan; M. Polini; G. Vignale; M. I. Katsnelson; A. Pinczuk; L. N. Pfeiffer; K. W. West; V. Pellegrini
• Keywords: Mott insulator; Lattice (music); Strongly correlated material

Electrons in artificial lattices enable explorations of the impact repulsive Coulomb interactions a tunable system. We have trapped two-dimensional electrons belonging to gallium arsenide quantum well nanofabricated lattice with honeycomb geometry. probe excitation spectrum magnetic field identifying novel collective modes that emerge from interaction as predicted by Mott-Hubbard model. These observations allow us determine Hubbard gap and suggest existence Coulomb-driven ground state. This approach offers new venues for study phenomena controllable solid-state