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.
@article{arxiv.cond-mat/0207578,
title = {Spectral Function in Mott Insulating Surfaces},
author = {L. O. Manuel and C. J. Gazza and A. E. Feiguin and A. E. Trumper},
journal= {arXiv preprint arXiv:cond-mat/0207578},
year = {2009}
}
Comments
5 pages, 4 figures. To be published in Journal of Physics: Condensed Matter