Novel phases in strongly coupled four-fermion theories

Catterall, Simon; Schaich, David Alexander (2017). Novel phases in strongly coupled four-fermion theories. Physical review. D - particles, fields, gravitation, and cosmology, 96(3), 034506. American Physical Society 10.1103/PhysRevD.96.034506

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We study a lattice model comprising four massless reduced staggered fermions in four dimensions coupled through an SUð4Þ-invariant four-fermion interaction. We present both theoretical arguments and numerical evidence that no bilinear fermion condensates are present for any value of the four-fermi coupling, in contrast to earlier studies of Higgs-Yukawa models with different exact lattice symmetries. At strong coupling we observe the formation of a four-fermion condensate and a mass gap in spite of the absence of bilinear condensates. Unlike those previously studied systems we do not find a ferromagnetic phase separating this strong-coupling phase from the massless weak-coupling phase. Instead we observe long-range correlations in a narrow region of the coupling, still with vanishing bilinear condensates. While our numerical results come from relatively small lattice volumes that call for caution in drawing conclusions, if this novel phase structure is verified by future investigations employing larger volumes it may offer the possibility for new continuum limits for strongly interacting fermions in four dimensions.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Schaich, David Alexander

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

02 Nov 2017 15:17

Last Modified:

02 Nov 2017 15:17

Publisher DOI:

10.1103/PhysRevD.96.034506

ArXiv ID:

1609.08541

BORIS DOI:

10.7892/boris.106413

URI:

https://boris.unibe.ch/id/eprint/106413

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