Volume 38, Number 7, June I 1997
|Page(s)||533 - 538|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Nesting effects on fermionic systems
Laboratoire de Physique Théorique et Hautes Energies - Jussieu,
75252 Paris Cedex 05
Centre de Recherches sur les Très Basses Temperatures -
Grenoble BP 166X Cedex
Accepted: 25 April 1997
We derive a general set of Poor Man's scaling equations and analyze the stability of gapless states in two-dimensional nested systems of spinless fermions. The effect of processes with momentum transfer parallel to the Fermi surface in destroying massless states is investigated. It will be shown that massless states may be stable but that due to these processes the system is placed near instabilities. We argue that the massless states correspond to a hybrid liquid, in between a Fermi and a Luttinger liquid. A superconductive instability is also shown to exist for purely repulsive interactions.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.45.-d – Collective effects / 75.10.-b – General theory and models of magnetic ordering
© EDP Sciences, 1997
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