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    題名: Nature of spin excitations in two dimensional Mott insulators : Undoped cuprates and other materials
    作者: Ho, Chang-ming;Muthukumar, V. N.;Ogata, M.;Anderson, P. W.
    貢獻者: 淡江大學物理學系
    日期: 2001-02
    上傳時間: 2013-07-09 15:22:01 (UTC+8)
    出版者: College Park: American Physical Society
    摘要: We investigate the excitation spectrum of a two-dimensional resonating valence bond (RVB) state. Treating the pi-flux phase with antiferromagnetic correlations as a variational ground state, we recover the long wavelength magnon as an "RVB exciton." However, this excitation does not exhaust the entire spectral weight and the high-energy spectrum is dominated by fermionic excitations. The latter can be observed directly by inelastic neutron scattering, and we predict their characteristic energy scales along different high symmetry directions in the magnetic Brillouin zone. We also interpret experimental results on two magnon Raman scattering and midinfrared absorption within this scenario.
    關聯: Physical Review Letters 86(8), pp.1626-1629
    DOI: 10.1103/PhysRevLett.86.1626
    顯示於類別:[物理學系暨研究所] 期刊論文

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