Disordered loops in the two-dimensional antiferromagnetic spin-fermion model (Articolo in rivista)

Type

• Prodotto della ricerca (Classe)
• Articolo in rivista (Classe)

Label

• Disordered loops in the two-dimensional antiferromagnetic spin-fermion model (Articolo in rivista) (literal)

Anno

• 2008-01-01T00:00:00+01:00 (literal)

Alternative label

• Enss, T; Caprara, S; Castellani, C; Di Castro, C; Grilli, M (2008)
  Disordered loops in the two-dimensional antiferromagnetic spin-fermion model
  in Nuclear physics. B (Print)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Enss, T; Caprara, S; Castellani, C; Di Castro, C; Grilli, M (literal)

Pagina inizio

• 578 (literal)

Pagina fine

• 595 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 795 (literal)

Rivista

• Nuclear physics. B (Rivista)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• \"Univ Roma La Sapienza, CNR INFM SMC Ctr, I-00185 Rome, Italy; Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy (literal)

Titolo

• Disordered loops in the two-dimensional antiferromagnetic spin-fermion model (literal)

Abstract

• The spin-fermion model has long been used to describe the quantum-critical behavior of 2d electron systems near an antiferromagnetic (AFM) instability. Recently, the standard procedure to integrate out the fermions and obtain an effective action for spin waves has been questioned in the clean case. We show that, in the presence of disorder, the single fermion loops display two crossover scales: upon lowering the energy, the singularities of the clean fermionic loops are first cut off, but below a second scale new singularities arise that lead again to marginal scaling. In addition, impurity lines between different fermion loops generate new relevant couplings which dominate at low energies. We outline a non-linear or model formulation of the single-loop problem, which allows to control the higher singularities and provides an effective model in terms of low-energy diffusive as well as spin modes. (c) 2007 Elsevier B.V. All rights reserved. (literal)

Autore CNR

• marco GRILLI (Unità di personale esterno)
• CARLO DI CASTRO (Persona)
• CLAUDIO CASTELLANI (Persona)
• SERGIO CAPRARA (Unità di personale esterno)

Insieme di parole chiave

• Keywords of "Disordered loops in the two-dimensional antiferromagnetic spin-fermion model" (Insieme di parole chiave)

Incoming links:

Autore CNR di

• marco GRILLI (Unità di personale esterno)
• SERGIO CAPRARA (Unità di personale esterno)
• CLAUDIO CASTELLANI (Persona)
• CARLO DI CASTRO (Persona)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Nuclear physics. B (Rivista)

Insieme di parole chiave di

• Keywords of "Disordered loops in the two-dimensional antiferromagnetic spin-fermion model" (Insieme di parole chiave)