TY - JOUR
T1 - Rotor spectra, berry phases, and monopole fields
T2 - From antiferromagnets to QCD
AU - Chandrasekharan, S.
AU - Jiang, F. J.
AU - Pepe, M.
AU - Wiese, U. J.
PY - 2008/10/21
Y1 - 2008/10/21
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevD.78.077901
DO - 10.1103/PhysRevD.78.077901
M3 - Article
AN - SCOPUS:55149113817
VL - 78
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
SN - 1550-7998
IS - 7
M1 - 077901
ER -