Quantum liquid with deconfined fractional excitations in three dimensions

Olga Sikora, Frank Pollmann, Nic Shannon, Karlo Penc, Peter Fulde

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Excitations which carry "fractional" quantum numbers are known to exist in one dimension in polyacetylene, and in two dimensions, in the fractional quantum Hall effect. Fractional excitations have also been invoked to explain the breakdown of the conventional theory of metals in a wide range of three-dimensional materials. However, the existence of fractional excitations in three dimensions remains highly controversial. In this Letter we report direct numerical evidence for the existence of an extended quantum liquid phase supporting fractional excitations in a concrete, three-dimensional microscopic model-the quantum dimer model on a diamond lattice. We demonstrate explicitly that the energy cost of separating fractional monomer excitations vanishes in this liquid phase, and that its energy spectrum matches that of the Coulomb phase in (3+1)-dimensional quantum electrodynamics.

Original languageEnglish
Article number247001
JournalPhysical review letters
Volume103
Issue number24
DOIs
Publication statusPublished - Dec 7 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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