Soliton approach to spin-Peierls antiferromagnets: Large-scale numerical results

Article

关键词: ANTI-FERROMAGNETIC CHAIN;    COMPOUND CUGEO3;    SYSTEM CUGEO3;    MAGNETIC-SUSCEPTIBILITY;    EXCITATION SPECTRUM;    NEUTRON-SCATTERING;    GROUND-STATE;    DIMERIZATION;    TRANSITION;    ALPHA'-NAV2O5;   

DOI  :  10.1103/PhysRevB.58.R14701

来源: SCIE

【 摘 要 】

A simple intuitive picture of spin-Peierls antiferromagnets arises from regarding the elementary excitations as S=1/2 solitons. We investigate these excitations numerically in a phononless model where spontaneous dimerization arises from frustration and the interchain coupling is treated in mean field theory. It is shown that in a strictly one-dimensional system without any explicit dimerization, soliton-antisoliton bound-states do not form and the solitons are repelled by impurities. Couplings to the three-dimensional lattice produce an effective confining potential and we show that in this case solitons bind to antisolitons and to impurities, with the number of such bound-states increasing as the interchain coupling goes to 0.

【 授权许可】

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