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  • Title: Edge Zeros and Boundary Spinons in Topological Mott Insulators.
    Author: Wagner N, Guerci D, Millis AJ, Sangiovanni G.
    Journal: Phys Rev Lett; 2024 Sep 20; 133(12):126504. PubMed ID: 39373420.
    Abstract:
    We use a real-space slave-rotor theory of the physics of topological Mott insulators, using the Kane-Mele-Hubbard model as an example, and show that a topological gap in the Green function zeros corresponds to a gap in the bulk spinon spectrum and implies a gapless band of edge zeros and a spinon edge mode. We then consider an interface between a topological Mott insulator and a conventional topological insulator showing how the spinon edge mode of the topological Mott insulator combines with the spin part of the conventional electron topological edge state, leaving a non-Fermi liquid edge mode described by a gapless propagating holon and gapped spinon state. Our work demonstrates the physical meaning of Green function zeros and shows that interfaces between conventional and Mott topological insulators are a rich source of new physics.
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