Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Topological Superconductors
TT 6.4: Vortrag
Montag, 9. März 2026, 10:15–10:30, CHE/0091
Topologically enabled superconductivity in 2D quantum materials — •Francesca Paoletti1, Daniele Guerci2, Giorgio Sangiovanni1, Urban F. P. Seifert3, and Elio J. König4 — 1JMU Würzburg — 2Massachusetts Institute of Technology — 3Universität zu Köln — 4University of Wisconsin-Madison
We investigate the role of Green's function zeros in strongly interacting topological Mott insulators, focusing on their meaning and physical interpretation. Recent advancements, particularly through slave rotor calculations of the Kane-Mele-Hubbard model, have established a connection between zeros and spinons and with U(1) gapped spin liquids. We find a macroscopic spin-charge separation resulting from the non-trivial interplay with the conventional boundary modes of the topological insulator. We further employ our method to an attractive Hubbard-Haldane honeycomb model. In this context, the extensive slave-rotor mean-field calculations are used as a microscopic foundation to determine the phase diagram of the model as well as important phenomenological properties, such as the coherence length and penetration depth (Pearl length) within a topologically enabled mechanism of superconductivity.
Keywords: slave-rotors; rhomboedral graphene; spin liquids; green's function zeros