Magnon dispersions in quantum Heisenberg ferrimagnetic chains at zero temperature

Article

关键词: MATRIX RENORMALIZATION-GROUP;    SPIN CHAINS;    HYDRODYNAMIC THEORY;    MAGNETIC-FIELD;    HUBBARD CHAINS;    PHASE;    ANTIFERROMAGNET;    SYSTEMS;    FERROMAGNETS;    EXCITATIONS;   

DOI  :  10.1103/PhysRevB.62.3271

来源: SCIE

【 摘 要 】

Within the Dyson-Maleev boson formalism, we study the zero-temperature magnon dispersions in a family of one-dimensional quantum Heisenberg ferrimagnets composed of two different spins (S-1,S-2) in the elementary cell. It is shown that the spin-wave theory can produce precise quantitative results for the low-energy excitations. The spin-stiffness constant rho(s) and the optical magnon gap Delta of different (S-1,S-2) ferrimagnetic systems are calculated, respectively, to second and third order in the quasiparticle interaction. The spin-wave results are compared with available numerical estimates.

【 授权许可】

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