Quantum phase transitions in bilayer SU(N) antiferromagnets

Ribhu K. Kaul

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

We present a detailed study of the destruction of SU(N) magnetic order in square lattice bilayer antiferromagnets using unbiased quantum Monte Carlo numerical simulations and field theoretic techniques. We study phase transitions from an SU(N) Néel state into two distinct quantum disordered "valence-bond" phases: a valence-bond liquid (VBL) with no broken symmetries and a lattice-symmetry-breaking valence-bond solid (VBS) state. For finite interlayer coupling, the cancellation of Berry phases between the layers has dramatic consequences on the two phase transitions: the Néel-VBS transition is first order for all N5 accesible in our model, whereas the Néel-VBL transition is continuous for N=2 and first order for N4; for N=3 the Néel-VBL transition show no signs of first-order behavior.

Original languageEnglish
Article number180411
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number18
DOIs
StatePublished - May 29 2012

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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