Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-01-08
Science 318, 1750 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
22 pages (including 3 figures)
Scientific paper
10.1126/science.1150124
Electrons in correlated insulators are prevented from conducting by Coulomb repulsion between them. When an insulator-to-metal transition is induced in a correlated insulator by doping or heating, the resulting conducting state can be radically different from that characterized by free electrons in conventional metals. We report on the electronic properties of a prototypical correlated insulator vanadium dioxide (VO2) in which the metallic state can be induced by increasing temperature. Scanning near-field infrared microscopy allows us to directly image nano-scale metallic puddles that appear at the onset of the insulator-to-metal transition. In combination with far-field infrared spectroscopy, the data reveal the Mott transition with divergent quasiparticle mass in the metallic puddles. The experimental approach employed here sets the stage for investigations of charge dynamics on the nanoscale in other inhomogeneous correlated electron systems.
Andreev Gregory O.
Balatsky Alexander V.
Basov Dimitri N.
Brehm Matthias
Chae Byung-Gyu
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