Evidence of two-spinon bound states in the magnetic spectrum of Ba3CoSb2O9

Article

关键词: LARGE-N EXPANSION;    TRIANGULAR-LATTICE;    QUANTUM;    ANTIFERROMAGNETS;    FLUCTUATIONS;    ORDER;   

DOI  :  10.1103/PhysRevB.106.064418

来源: SCIE

【 摘 要 】

Recent inelastic neutron scattering (INS) experiments of the triangular antiferromagnet Ba3CoSb2O9 revealed strong deviations from semiclassical theories. We demonstrate that key features of the INS data are well reproduced by a parton Schwinger boson theory beyond the saddle-point approximation. The measured magnon dispersion is well reproduced by the dispersion of two-spinon bound states (poles of the emergent gauge fields propagator), while the low-energy continuum scattering is reproduced by a quasifree two-spinon continuum, suggesting that a free spinon gas is a good initial framework to study magnetically ordered states near a quantum melting point.

【 授权许可】

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