Frustrated Heisenberg antiferromagnets: Fluctuation-induced first order vs. deconfined quantum criticality

F Kruger, S Scheidl

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Recently it was argued that quantum phase transitions can be radically different from classical phase transitions with, as a highlight, the "deconfined critical points" exhibiting fractionalization of quantum numbers due to Berry phase effects. Such transitions are supposed to occur in frustrated ("J(1)-J(2)") quantum magnets. We have developed a novel renormalization approach for such systems which is fully respecting the underlying lattice structure. According to our findings, another profound phenomenon is around the corner: a fluctuation-induced (order-out-of-disorder) first-order transition. This has to occur for large spin and we conjecture that it is responsible for the weakly first-order behavior recently observed in numerical simulations for frustrated S = 1/2 systems.

Original languageEnglish
Pages (from-to)896-902
Number of pages7
JournalEPL
Volume74
Issue number5
DOIs
Publication statusPublished - Jun 2006

Keywords

  • GROUND-STATES
  • VALENCE-BOND
  • SPIN-PEIERLS
  • LATTICE

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