Investigation of soliton bound states in the Raman spectrum of pure and doped spin-Peierls chains

Abstract

We investigate the occurrence of singlet bound states in the Raman spectrum of dimerized spin 1/2 chains by Exact Diagonalization and Density Matrix Renormalization Group techniques. We predict that several bulk $\delta$-peaks could be observed in pure systems. Furthermore, we show that new low energy lines arise from non-magnetic impurity doping. These features are interpreted in terms of soliton-antisoliton and soliton-impurity bound states respectively. Energies and spectral weights associated with these bound states are sensitive to lattice relaxation effects. Our results are discussed in the context of the inorganic spin-Peierls compound CuGeO${}_3$ and quantitatively compared to recent Raman experiments.

References in corpus (12)

• Reexamination of the microscopic couplings of the quasi one-dimensional antiferromagnet CuGeO_3
• Enhancement of Antiferromagnetic Correlations Induced by Nonmagnetic Impurities: Origin and Predictions for NMR Experiments
• Double gap and solitonic excitations in the spin-Peierls chain CuGeO3
• Elementary Excitations in Dimerized and Frustrated Heisenberg Chains
• Soliton Approach to Spin-Peierls Antiferromagnets: Large-Scale Numerical Results
• Peierls Dimerization with Non-Adiabatic Spin-Phonon Coupling
• Dynamical properties of the spin-Peierls compound α'--NaV2O5
• Numerical Study of the Incommensurate Phase in Spin-Peierls Systems
• Unified Quantum Mechanical Picture for Confined Spinons in Dimerized and Frustrated Spin S=1/2 Chains
• Dynamical effects of phonons on soliton binding in spin-Peierls systems
• Observation of three-magnon light scattering in CuGeO_3
• A magnetic model for the incommensurate I phase of spin-Peierls systems

Cited by in corpus (19)

• New Trends in Density Matrix Renormalization
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• Temperature Dependence of Spin and Bond Ordering in a Spin-Peierls System
• Quenches and confinement in a Heisenberg-Ising spin ladder
• Excitation Spectra of Structurally Dimerized and Spin-Peierls Chains in a Magnetic Field
• Confinement in the spectrum of a Heisenberg-Ising spin ladder
• Magnetic responses of randomly depleted spin ladders
• Spinon excitation spectra of the $J_1$-$J_2$ chain from analytical calculations in the dimer basis and exact diagonalization
• Low-energy excitations of spin-Peierls chains with modified bond-impurities
• Quasi-particle interactions in frustrated Heisenberg chains
• Energy relaxation in disordered charge and spin density waves
• Electron spins interaction in the spin-Peierls phase of the organic spin chain (o -DMTTF) 2 X (X = Cl, Br, I)
• Raman Scattering cross section of Spin Ladders
• Theory of the Raman spectra of the Shastry-Sutherland antiferromagnet SrCu${}_2$(BO${}_3$)${}_2$ doped with nonmagnetic impurities
• Electron Spin Resonance of Defects in Spin Chains. o-(DMTTF)2X : a versatile system behaving like molecular magnet
• Crystalline topological defects within response theory
• Position of Effective Spins Induced by Dilution in Two-Dimensional Spin-Peierls Systems