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Finite Temperature Effects in One-dimensional Mott-Hubbard Insulator: Angle-Resolved Photoemission Study of Na_{0.96}V_{2}O_{5}

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arxiv cond-mat/9808334 v3 pith:QXN4BO24 submitted 1998-08-31 cond-mat.str-el

K. Kobayashi , T. Mizokawa , A. Fujimori , M. Isobe , Y. Ueda , T. Tohyama , S. Maekawa This is my paper
classification cond-mat.str-el
keywords finiteone-dimensionaltemperatureangle-resolvedbandeffectsinsulatormott-hubbard
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We have made an angle-resolved photoemission study of a one-dimensional (1D) Mott-Hubbard insulator Na_{0.96}V_{2}O_{5} and found that the spectra of the V 3d lower Hubbard band are strongly dependent on the temperature. We have calculated the one-particle spectral function of the one-dimensional t-J model at finite temperatures by exact diagonalization and compared them with the experimental results. Good overall agreement is obtained between experiment and theory. The strong finite temperature effects are discussed in terms of the existence of the ``Fermi surface'' of the spinon band.

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