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】
Free