Advances in Solid State Physics pp 95-112

Part of the Advances in Solid State Physics book series (ASSP, volume 43)

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Optical Spectroscopy of Low-Dimensional Quantum Spin Systems

  • Markus Grüninger
  • Marco Windt
  • Eva Benckiser
  • Tamara S. Nunner
  • Kai P. Schmidt
  • Götz S. Uhrig
  • Thilo Kopp
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Abstract

Low-dimensional quantum spin systems display fascinating excitation spectra. In recent years, optical spectroscopy was shown to be a powerful tool for the study of these spectra by means of phonon-assisted infrared absorption. We discuss the results of antiferromagnetic S=1/2 cuprates with various topologies: the spinon continuum observed in the weakly coupled chains of CaCu2O3, two-triplet bound states and the continuum of the two-leg ladders in (La,Ca)14Cu24O41, and the bimagnon-plus-phonon spectrum of the bilayer YBa2Cu3O6, an undoped parent compound of the 2D high-Tc cuprates. Various theoretical approaches (dynamical DMRG, continuous unitary transformations (CUT), and spin-wave theory) are used for a quantitative analysis. Particular attention is paid to the role of the cyclic four-spin exchange.

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Authors and Affiliations

  • Markus Grüninger
    • 1
  • Marco Windt
    • 1
  • Eva Benckiser
    • 1
  • Tamara S. Nunner
    • 2
  • Kai P. Schmidt
    • 3
  • Götz S. Uhrig
    • 3
  • Thilo Kopp
    • 2
  1. 1.II. Physikalisches InstitutUniversität zu KölnCologneGermany
  2. 2.Experimentalphysik VIUniversität AugsburgAugsburgGermany
  3. 3.Institut für Theoretische PhysikUniversität zu KölnCologneGermany

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