Fractional and Integer Excitations in Quantum Antiferromagnetic Spin1/2Ladders

2001/06/30 by Christian Knetter, C. Knetter, Kai Phillip Schmidt +4 · 4 citations
Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.87.167204

published as Phys. Rev. Lett. 87, 167204 · 6 pages, 4 figures included, minor text changes, improved figures

arxiv created 2001/09/28 · openalex publication_date 2001/10/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Spectral densities are computed in unprecedented detail for quantum antiferromagnetic spin 1/2 two-leg ladders. These results were obtained due to a major methodical advance achieved by optimally chosen unitary transformations. The approach is based on dressed integer excitations. Considerable weight is found at high energies in the two-particle sector. Precursors of fractional spinon physics occur supporting the conclusion that there is no necessity to resort to fractional excitations in order to describe features at higher energies.

Citations

• Dispersion and Symmetry of Bound States in the Shastry-Sutherland Model
• Spin dynamics and transport in gapped one-dimensional Heisenberg antiferromagnets at nonzero temperatures
• Strong-Coupling Expansions for Multiparticle Excitations: Continuum and Bound States
• Flow‐equations for Hamiltonians

Cited by

• Optical absorption spectra inSrCu2O3two-leg spin ladder
• High order perturbation theory for spectral densities of multi-particle excitations: S = (1)/(2) two-leg Heisenberg ladder
• Dynamical structure factor for the alternating Heisenberg chain: A linked cluster calculation
• Spectral properties of the dimerized and frustratedS=1/2chain