Dynamical central peak and spinon deconfinement in frustrated spin chains

Abstract

Studying the dynamical spin structure factor in frustrated spin chains with spontaneously dimerized ground state we show that besides the gapped spin-wave excitations there appears at finite temperatures also a sharp central peak. The latter can be attributed to deconfined spinons, accounted well within the variational approach. The central peak remains well pronounced within the local spin dynamics and may be relevant for experiments on materials with 1D frustrated spin chains.

arXiv comment4 pages, 5 figures

References in corpus (9)

• Dimerization and Incommensurate Spiral Spin Correlations in the Zigzag Spin Chain: Analogies to the Kondo Lattice
• Numerical Evidence for Multiplicative Logarithmic Corrections from Marginal Operators
• Soliton Approach to Spin-Peierls Antiferromagnets: Large-Scale Numerical Results
• Transition from Haldane Phase to Spin Liquid and Incommensurate Correlation in Spin-1/2 Heisenberg Chains
• Spin Dynamics of the One-Dimensional J-J' Model and Spin-Peierls Transition in CuGeO_3
• Majorana Fermion Representation For An Antiferromagnetic Spin-1/2 Chain
• Spin dynamics of the spin-Peierls compound CuGeO_3 under magnetic field
• Finite-temperature dynamics with the density-matrix renormalization group method
• Dynamical properties of the compounds CuGeO_3 and α'--NaV_2O_5 at temperatures $T\ne 0$

Cited by in corpus (1)

• Spinon excitation spectra of the $J_1$-$J_2$ chain from analytical calculations in the dimer basis and exact diagonalization