Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder

B. Thielemann; Ch. Rüegg; H. M. Rønnow; A. M. Läuchli; J. -S. Caux; B. Normand; D. Biner; K. W. Krämer; H. -U. Güdel; J. Stahn; K. Habicht; K. Kiefer; M. Boehm; D. F. McMorrow; J. Mesot

doi:10.1103/PhysRevLett.102.107204

Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder

Strongly Correlated Electrons 2009-03-25 v1

Authors: B. Thielemann , Ch. Rüegg , H. M. Rønnow , A. M. Läuchli , J. -S. Caux , B. Normand , D. Biner , K. W. Krämer , H. -U. Güdel , J. Stahn , K. Habicht , K. Kiefer , M. Boehm , D. F. McMorrow , J. Mesot

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Abstract

We measure by inelastic neutron scattering the spin excitation spectra as a function of applied magnetic field in the quantum spin-ladder material (C5H12N)2CuBr4. Discrete magnon modes at low fields in the quantum disordered phase and at high fields in the saturated phase contrast sharply with a spinon continuum at intermediate fields characteristic of the Luttinger-liquid phase. By tuning the magnetic field, we drive the fractionalization of magnons into spinons and, in this deconfined regime, observe both commensurate and incommensurate continua.

Keywords

magnon fractionalization quantum spin ladder inelastic neutron scattering spinon continuum Luttinger liquid deconfined regime

Cite

@article{arxiv.0812.3880,
  title  = {Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder},
  author = {B. Thielemann and Ch. Rüegg and H. M. Rønnow and A. M. Läuchli and J. -S. Caux and B. Normand and D. Biner and K. W. Krämer and H. -U. Güdel and J. Stahn and K. Habicht and K. Kiefer and M. Boehm and D. F. McMorrow and J. Mesot},
  journal= {arXiv preprint arXiv:0812.3880},
  year   = {2009}
}

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4 pages, 4 figures

Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder

Abstract

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