The photoemission spectra of Mott insulating surfaces

ADOLFO EMILIO TRUMPER; MANUEL, LO

Dresden

Workshop; Workshop on Strong Correlations and ARPES: Recent Progress in Theory and Experiment; 2005

Max Planck Institute for Physics of Complex Systems

We show theoretically the fingerprints of short-range spiral magnetic correlations in the photoemission spectra of the Mott insulating ground states realized in the $sqrt{3}X sqrt{3}$ triangular silicon surfaces K/Si(111)-B and SiC(0001). The calculated spectra present low energy features of magnetic origin with a reduced dispersion $sim 10-40$ meV compared with the center-of-mass spectra bandwidth $sim 0.2-0.3$ 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.