Abstract: In the recent literature, the concept of topological Mott insulator has been spelled out in rather different ways. Due to the intrinsic many-body nature, a comprehensive classification is challenging to formulate. In this talk I will discuss a novel, remarkably simple way of describing topological Mott insulators based on the momentum dispersion of single-particle Green's function zeros. After focusing on the fate of the bulk-boundary correspondence, I will propose a way of revealing the physical consequences of the boundary zeros based on the hybridization with conventional topologically protected edge modes. In the final part of the talk I will give an intepretation in terms of fractionalized electrons and boundary spinons of a U(1) gapped spin liquid phase.
References
N. Wagner, et al. Mott insulators with boundary zeros. Nat Commun 14, 7531 (2023).
N. Wagner, et al. Edge Zeros and Boundary Spinons in Topological Mott Insulators. Phys. Rev. Lett. 133, 126504 (2024).