Thermodynamic properties of Fermi systems with flat single-particle spectra

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The behavior of strongly correlated Fermi systems is investigated beyond the onset of a phase transition where the single-particle spectrum $ξ({\bf p})$ becomes flat. The Landau-Migdal quasiparticle picture is shown to remain applicable on the ordered side of this transition. Nevertheless, low-temperature properties evaluated within this picture show profound changes relative to results of Landau theory, as a direct consequence of the flattening of $ξ({\bf p})$. Stability conditions for this class of systems are examined, and the nature of antiferromagnetic quantum phase transitions is elucidated.
5 pages, 5 figures

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/157507

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0502292
 http://arxiv.org/abs/cond-mat/0502292
 Europhys. Lett. 72, 256 (2005)
 doi:10.1209/epl/i2005-10233-9

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arXiv