Spectral Function in Mott Insulating Surfaces

TL;DR

This paper theoretically investigates the photoemission spectra of Mott insulating surfaces with short-range spiral magnetic correlations, revealing magnetic features and quasiparticle behavior near Goldstone modes.

Contribution

It introduces a theoretical analysis of magnetic fingerprints in the spectra of specific Mott insulators on silicon surfaces, highlighting their potential for studying unconventional quasiparticles.

Findings

Magnetic origin features in photoemission spectra with reduced dispersion

Quasiparticle signals survive only around magnetic Goldstone modes

Spectra bandwidths are approximately 0.2-0.3 eV

Abstract

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.