Variational coupled-cluster study of plasmonlike excitations in quantum antiferromagnets

Article

关键词: LONGITUDINAL SPIN FLUCTUATIONS;    SQUARE-LATTICE ANTIFERROMAGNET;    HEISENBERG-ANTIFERROMAGNET;    EXCITED-STATES;    WAVE THEORY;    EXTENSION;    FORMALISM;    SYSTEMS;   

DOI  :  10.1103/PhysRevB.74.212401

来源: SCIE

【 摘 要 】

We study plasmonlike excitations in quantum antiferromagnets by the recently proposed variational coupled-cluster method. Within our approximation, we find that these spin-zero excitations have a nonzero energy gap in a cubic lattice and are gapless in a square lattice, similar to the plasmons in quantum electron gases.

【 授权许可】

Free