期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 21, 期 43, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/21/43/435604
关键词
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资金
- NSF [DMR-0312680, DMR-0113574, SCI-9619020]
- Division of Scientific User Facilities, US Department of Energy
A numerically implementable multi-scale many-body approach to strongly correlated electron systems is introduced. An extension to quantum cluster methods, it approximates correlations on any given length-scale commensurate with the strength of the correlations on the respective scale. Short length-scales are treated explicitly, long ones are addressed at a dynamical mean-field level and intermediate length-regime correlations are assumed to be weak and are approximated diagrammatically. To illustrate and test this method, we apply it to the one-dimensional Hubbard model. The resulting multi-scale self-energy provides a very good quantitative agreement with substantially more numerically expensive, explicit quantum Monte Carlo calculations.
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