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TT: Fachverband Tiefe Temperaturen

TT 74: Topological Insulators

TT 74.9: Talk

Thursday, March 21, 2024, 17:15–17:30, H 3005

Physical consequence of edge zeros in topological Mott insulators — •Niklas Wagner¹, Daniele Guerci², Andrew J. Millis^2,3, and Giorgio Sangiovanni¹ — ¹Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany — ²Center for Computational Quantum Physics, Flatiron Institute, New York, USA — ³Department of Physics, Columbia University, New York, USA

Recently, Green’s function zeros and their relation to topology have attracted considerable interest [1-4]. Using slave-rotor calculations I will demonstrate a connection between gapless zeros and gapless spinons – both in the bulk and at the boundary. I will then apply these results to interfaces between topological insulators and topological Mott insulators, showing that the previously observed annihilation of edge zeros and egde poles [4] can be interpreted using the spinon language. This approach reveals the occurance of a spin-charge separation at the interface.

[1] A. Blason and M. Fabrizio, arxiv:2304.08180(2023)

[2] J. Zhao, P. Mai, B. Bradlyn, P. Phillips, arXiv:2305.02341 (2023)

[3] C. Setty et al., arXiv:2309.14340 (2023)

[4] N.Wagner et al., Nat. Commun. 14, 7531 (2023)

Keywords: topology; strong correlation; Mott physics