Format

Send to

Choose Destination
Science. 2007 Dec 14;318(5857):1750-3.

Mott transition in VO2 revealed by infrared spectroscopy and nano-imaging.

Author information

1
Physics Department, University of California-San Diego, La Jolla, CA 92093, USA. mumtaz@physics.ucsd.edu

Abstract

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 in which the metallic state can be induced by increasing temperature. Scanning near-field infrared microscopy allows us to directly image nanoscale 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 quasi-particle mass in the metallic puddles. The experimental approach used sets the stage for investigations of charge dynamics on the nanoscale in other inhomogeneous correlated electron systems.

PMID:
18079396
DOI:
10.1126/science.1150124
Free full text

Supplemental Content

Full text links

Icon for HighWire
Loading ...
Support Center