Order by disorder in a four-flavor Mott insulator on the fcc lattice

Péter Sinkovicz, Gergely Szirmai, K. Penc

Research output: Contribution to journalArticle

Abstract

The classical ground states of the SU(4) Heisenberg model on the face-centered-cubic lattice constitute a highly degenerate manifold. We explicitly construct all the classical ground states of the model. To describe quantum fluctuations above these classical states, we apply linear flavor-wave theory. At zero temperature, the bosonic flavor waves select the simplest of these SU(4) symmetry-breaking states, the four-sublattice-ordered state defined by the cubic unit cell of the fcc lattice. Due to geometrical constraints, flavor waves interact along specific planes only, thus rendering the system effectively two dimensional and forbidding ordering at finite temperatures. We argue that longer-range interactions generated by quantum fluctuations can shift the transition to finite temperatures.

Original languageEnglish
Article number075137
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume93
Issue number7
DOIs
Publication statusPublished - Feb 18 2016

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Flavors
Crystal lattices
insulators
disorders
Ground state
face centered cubic lattices
ground state
Temperature
sublattices
temperature
broken symmetry
shift
cells
interactions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Order by disorder in a four-flavor Mott insulator on the fcc lattice. / Sinkovicz, Péter; Szirmai, Gergely; Penc, K.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 93, No. 7, 075137, 18.02.2016.

Research output: Contribution to journalArticle

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