Rotor spectra, berry phases, and monopole fields: From antiferromagnets to QCD

S. Chandrasekharan, F. J. Jiang, M. Pepe, U. J. Wiese

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10 Citations (Scopus)


The order parameter of a finite system with a spontaneously broken continuous global symmetry acts as a quantum mechanical rotor. Both antiferromagnets with a spontaneously broken SU(2)s spin symmetry and massless QCD with a broken SU(2)L×SU(2)R chiral symmetry have rotor spectra when considered in a finite volume. When an electron or hole is doped into an antiferromagnet or when a nucleon is propagating through the QCD vacuum, a Berry phase arises from a monopole field and the angular momentum of the rotor is quantized in half-integer units.

Original languageEnglish
Article number077901
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number7
Publication statusPublished - 2008 Oct 21


ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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