Redistribution of Spectral Weight in Spin-1/2-Doped Haldane Chains

Details Redistribution of Spectral Weight in Spin-1/2-Doped Haldane Chains Redistribution of Spectral Weight in Spin-1/2-Doped Haldane Chains

2001-06-19

arxiv.org/abs/cond-mat/0106385v1

Phys. Rev. B. 65, 132402 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

RevTex, 4 pages with 4 figures

Scientific paper

10.1103/PhysRevB.65.132402

We study the evolution of the dynamical spin structure factor in a spin-1 antiferromagnetic Heisenberg chain which is randomly doped with spin-1/2 moments. Using stochastic series expansion Quantum Monte Carlo simulations combined with the Maximum Entropy method, we monitor the crossover from the spin-1 chain, dominated by a single resonance at the Haldane energy, to the spin-1/2 chain with a continuum of spinon states which diverges at zero-frequency. Upon increasing the doping level, spectral weight is rapidly transferred from the Haldane peak to lower energies. If the exchange couplings between the spin-1/2 substituents and the spin-1 sites of the host are sufficiently small, finite-frequency bound states are observed below the spin gap for small doping concentrations.

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