Published December 30, 2002
| Published
Journal Article
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Quantum fluctuations and the closing of the Coulomb gap in a correlated insulator
Abstract
The "switchable mirror" yttrium hydride is one of the few strongly correlated systems with a continuous Mott-Hubbard metal-insulator transition. We systematically map out the low temperature electrical transport from deep in the insulator to the quantum critical point using persistent photoconductivity as a drive parameter. Both activated hopping over a Coulomb gap and power-law quantum fluctuations must be included to describe the data. Collapse of the data onto a universal curve within a dynamical scaling framework (with corrections) requires zν=6.0±0.5, where ν and z are the static and dynamical critical exponents, respectively.
Additional Information
© 2002 The American Physical Society. (Received 11 April 2002; published 20 December 2002) We are indebted to S.M. Girvin and S. Sachdev for explaining the nuances of the scaling theory, to R. J. Wijngaarden for scientific advice, and to B. Dam, S. Enache, and N. J. Koeman for technical assistance. The work at the University of Chicago was supported by NSF DMR-0114798.Attached Files
Published - PhysRevLett.89.276402.pdf
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PhysRevLett.89.276402.pdf
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Additional details
- Eprint ID
- 46960
- Resolver ID
- CaltechAUTHORS:20140707-163029501
- NSF
- DMR-0114798
- Created
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2014-07-11Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field