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

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.

Keywords

Optical Conductivity Spectral Weight Magnetic Contribution Magnetic Excitation Polarization Parallel 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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