Strongly interacting fermions and phases of the casimir effect

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

With the intent of exploring how the interplay between boundary effects and chiral symmetry breaking may alter the thermodynamical behavior of a system of strongly interacting fermions, we study the Casimir effect for the setup of two parallel layers using a four-fermion effective field theory at zero density. This system reveals a number of interesting features. While for infinitely large separation (no boundaries), chiral symmetry is broken or restored via a second order phase transition, in the opposite case of small (and, in general, finite) separation the transition becomes first order, rendering effects of finite size, for the present setup, similar to those of a chemical potential. Appropriately moving on the separation-temperature plane, it is possible to generate a peculiar behavior in the temperature dependence of the thermodynamic potential and of the condensate, compensating thermal with geometrical variations. A behavior similar to what we find here has been predicted to occur in bilayer graphene. Chiral symmetry breaking induces different phases (massless and massive) in the Casimir force separated by critical lines.

Original languageEnglish
Article number060401
JournalPhysical Review Letters
Volume110
Issue number6
DOIs
Publication statusPublished - 2013 Feb 4
Externally publishedYes

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broken symmetry
fermions
condensates
graphene
thermodynamics
temperature dependence
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Strongly interacting fermions and phases of the casimir effect. / Flachi, Antonino.

In: Physical Review Letters, Vol. 110, No. 6, 060401, 04.02.2013.

Research output: Contribution to journalArticle

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