Theoretical study of the optical conductivity of alpha '-NaV2O5

Article

关键词: SPIN-PEIERLS COMPOUND;    DYNAMICAL PROPERTIES;    NEUTRON-SCATTERING;    NAV2O5;    TEMPERATURE;    SYSTEMS;    CUGEO3;   

DOI  :  10.1103/PhysRevB.60.R8438

来源: SCIE

【 摘 要 】

Using finite temperature diagonalization techniques, it is shown that the quarter-filled t-J-V model on a trellis lattice structure provides a quantitative explanation of the highly anisotropic optical conductivity of the (alpha'-NaV2O5 compound. The combined effects of the short-range Coulomb interaction and valence fluctuations of V ions determine the main absorption and the fundamental gap. Interladder hopping is necessary for the explanation of the anomalous in-gap absorption and generation of spectral weight at high energy. The role of valence fluctuations is explained in terms of the domain wall excitations of an anisotropic two-dimensional Ising model in a transverse field close to criticality.

【 授权许可】

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