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Quantum fluctuations and the closing of the Coulomb gap in a correlated insulator

Roy, A. S. and Hoekstra, A. F. Th. and Rosenbaum, T. F. and Griessen, R. (2002) Quantum fluctuations and the closing of the Coulomb gap in a correlated insulator. Physical Review Letters, 89 (27). Art. No. 276402. ISSN 0031-9007. doi:10.1103/PhysRevLett.89.276402. https://resolver.caltech.edu/CaltechAUTHORS:20140707-163029501

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevLett.89.276402DOIArticle
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.89.276402PublisherArticle
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.
Funders:
Funding AgencyGrant Number
NSFDMR-0114798
Issue or Number:27
Classification Code:PACS numbers: 71.30.+h, 71.27.+a, 72.20.–i, 73.50.–h
DOI:10.1103/PhysRevLett.89.276402
Record Number:CaltechAUTHORS:20140707-163029501
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140707-163029501
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46960
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:11 Jul 2014 17:22
Last Modified:10 Nov 2021 17:32

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