Renormalized quasiparticles in antiferromagnetic states
of the Hubbard model |
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Authors: | J Bauer A C Hewson |
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Institution: | (1) Department of Mathematics, Imperial College, London, SW7 2AZ, UK |
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Abstract: | We analyze the properties of the quasiparticle excitations of metallic
antiferromagnetic states in a strongly correlated electron system. The study is based on
dynamical mean field theory (DMFT) for the infinite dimensional Hubbard model with
antiferromagnetic symmetry breaking. Self-consistent solutions of the DMFT
equations are calculated using the numerical renormalization group (NRG). The
low energy behavior in these results is then analyzed in terms
of renormalized quasiparticles. The parameters for these quasiparticles are
calculated directly from the NRG derived self-energy, and also from the low
energy fixed point of the effective impurity model. From these the quasiparticle
weight and the effective mass are deduced. We show that
the main low energy features of the k-resolved spectral density can be understood in
terms of the quasiparticle picture. We also find that Luttinger's theorem
is satisfied for the total electron number in the doped antiferromagnetic
state. |
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Keywords: | 71 10 Fd Lattice fermion models (Hubbard model etc ) 71 27 +a Strongly correlated electron systems heavy fermions |
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