Massive fermions without fermion bilinear condensates

Journal Article

© 2015 American Physical Society. We study a lattice field theory model containing two flavors of massless staggered fermions with an onsite four-fermion interaction. The model contains an SU(4) symmetry which forbids nonzero fermion bilinear mass terms, due to which there is a massless fermion phase at weak couplings. However, even at strong couplings fermion bilinear condensates do not appear in our model, although fermions do become massive. While the existence of this exotic strongly coupled massive fermion phase was established long ago, the nature of the transition between the massless and the massive phase has remained unclear. Using Monte Carlo calculations in three space-time dimensions, we find evidence for a direct second-order transition between the two phases suggesting that the exotic lattice phase may have a continuum limit at least in three dimensions. A similar exotic second-order critical point was found recently in a bilayer system on a honeycomb lattice.

Full Text

Duke Authors

Cited Authors

  • Ayyar, V; Chandrasekharan, S

Published Date

  • March 30, 2015

Published In

Volume / Issue

  • 91 / 6

Electronic International Standard Serial Number (EISSN)

  • 1550-2368

International Standard Serial Number (ISSN)

  • 1550-7998

Digital Object Identifier (DOI)

  • 10.1103/PhysRevD.91.065035

Citation Source

  • Scopus