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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/27866


    Title: Nature of spin excitations in two dimensional Mott insulators : Undoped cuprates and other materials
    Authors: Ho, Chang-ming;Muthukumar, V. N.;Ogata, M.;Anderson, P. W.
    Contributors: 淡江大學物理學系
    Date: 2001-02
    Issue Date: 2013-07-09 15:22:01 (UTC+8)
    Publisher: College Park: American Physical Society
    Abstract: 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.
    Relation: Physical Review Letters 86(8), pp.1626-1629
    DOI: 10.1103/PhysRevLett.86.1626
    Appears in Collections:[物理學系暨研究所] 期刊論文

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