ISSN:
1434-6036
Keywords:
PACS. 71.10.Fd Lattice fermion models (Hubbard model, etc.) - 71.27.+a Strongly correlated electron systems; heavy fermions - 75.20.Hr Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: We develop a Non-Crossing Approximation (NCA) for the effective cluster problem of the recently developed Dynamical Cluster Approximation (DCA). The DCA technique includes short-ranged correlations by mapping the lattice problem onto a self-consistently embedded periodic cluster of size . It is a fully causal and systematic approximation to the full lattice problem, with corrections in two dimensions. The NCA we develop is a systematic approximation with corrections . The method will be discussed in detail and results for the one-particle properties of the Hubbard model are shown. Near half filling, the spectra display pronounced features including a pseudogap and non-Fermi-liquid behavior due to short-ranged antiferromagnetic correlations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510050077
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