Spectroscopic fingerprints of a surface Mott-Hubbard insulator: the case of SiC(0001)

Details Spectroscopic fingerprints of a surface Mott-Hubbard insulator: the case of SiC(0001) Spectroscopic fingerprints of a surface Mott-Hubbard insulator: the case of SiC(0001)

2000-06-16

arxiv.org/abs/cond-mat/0006261v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures, ECOSS-18 conference

Scientific paper

10.1016/S0039-6028(00)00236-3

We discuss the spectroscopic fingerprints that a surface Mott-Hubbard insulator should show at the intra-atomic level. The test case considered is that of the Si-terminated SiC(0001) sqrt{3}xsqrt{3} surface, which is known experimentally to be insulating. We argue that, due to the Mott-Hubbard phenomenon, spin unpaired electrons in the Si adatom dangling bonds are expected to give rise to a Si-2p core level spectrum with a characteristic three-peaked structure, as seen experimentally. This structure results from the joint effect of intra-atomic exchange, spatial anisotropy, and spin-orbit coupling. Auger intensities are also discussed.

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