U parameter of the mott-hubbard insulator 6H-SiC(0001)-(sqrt |
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Authors: | Rohlfing Pollmann |
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Institution: | Institut fur Theoretische Physik II, Universitat Munster, Wilhelm-Klemm-Strasse 10, 48149 Munster, Germany. |
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Abstract: | The 6H-SiC(0001)-(sqrt3]xsqrt3])R30 degrees surface exhibits one half-filled localized dangling-bond orbital per surface unit cell. Its electronic structure can accurately be described as a Mott-Hubbard insulator. We investigate its spectrum by a spin-polarized ab initio quasiparticle calculation. The resulting band structure shows one occupied and one empty surface band, separated by a direct band gap of 1.95 eV. Since the band gap in the spectrum of the Hubbard model is directly given by the on-site Coulomb-interaction parameter U of the dangling-bond orbital, our results allow for a reliable determination of U = 1.95 eV. |
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