Spectral Function in Mott Insulating Surfaces

Details Spectral Function in Mott Insulating Surfaces Spectral Function in Mott Insulating Surfaces

2002-07-24

arxiv.org/abs/cond-mat/0207578v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures. To be published in Journal of Physics: Condensed Matter

Scientific paper

10.1088/0953-8984/15/17/301

We show theoretically the fingerprints of short-range spiral magnetic correlations in the photoemission spectra of the Mott insulating ground states realized in the triangular silicon surfaces K/Si(111)-B and SiC(0001). The calculated spectra present low energy features of magnetic origin with a reduced dispersion ~10-40 meV compared with the center-of-mass spectra bandwidth ~0.2-0:3 eV. Remarkably, we find that the quasiparticle signal survives only around the magnetic Goldstone modes. Our findings would position these silicon surfaces as new candidates to investigate non-conventional quasiparticle excitations.

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