Dynamical effects of phonons on soliton binding in spin-Peierls systems

Article

关键词: ANTI-FERROMAGNETIC CHAIN;    COMPOUND CUGEO3;    MAGNETIC-SUSCEPTIBILITY;    EXCITATION SPECTRUM;    HEISENBERG-CHAINS;    TRANSITION;    ALPHA'-NAV2O5;    DIMERIZATION;    QUANTUM;    RENORMALIZATION;   

DOI  :  10.1103/PhysRevB.58.9110

来源: SCIE

【 摘 要 】

The role of dynamical magnetoelastic coupling in spin-Peierls chains is investigated by numerical and analytical techniques. We show that a Heisenberg spin chain coupled to dynamical optical phonons exhibits a transition towards a spontaneously dimerized state in a wide range of parameter space. The low-energy excitations are characterized as solitons. No binding between solitons occurs in the isolated spin-phonon chain and the dynamical spin structure factor shows a broad magnon dispersion. However, elastic interchain coupling can lead to the formation of bound states. [S0163-1829(98)09438-7].

【 授权许可】

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