Strongly disordered spin ladders

R. Mélin, Y. C. Lin, P. Lajkó, H. Rieger, F. Iglói, F. Iglói, F. Iglói

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

The effect of quenched disorder on the low-energy properties of various antiferromagnetic spin-ladder models is studied by a numerical strong disorder renormalization-group method and by density-matrix renormalization. For strong enough disorder the originally gapped phases with finite topological or dimer order become gapless. In these quantum Griffiths phases the scaling of the energy, as well as the singularities in the dynamical quantities, are characterized by a finite dynamical exponent, z, which varies with the strength of disorder. At the phase boundaries, separating topologically distinct Griffiths phases the singular behavior of the disordered ladders is generally controlled by an infinite randomness fixed point.

Original languageEnglish
Article number104415
Pages (from-to)1044151-10441510
Number of pages9397360
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number10
Publication statusPublished - Mar 1 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Mélin, R., Lin, Y. C., Lajkó, P., Rieger, H., Iglói, F., Iglói, F., & Iglói, F. (2002). Strongly disordered spin ladders. Physical Review B - Condensed Matter and Materials Physics, 65(10), 1044151-10441510. [104415].