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Theory of local $\mathbb{Z}_{2}$ topological markers for finite and periodic two-dimensional systems

Published 6 Apr 2024 in cond-mat.mes-hall, cond-mat.dis-nn, and cond-mat.mtrl-sci | (2404.04598v2)

Abstract: The topological phases of two-dimensional time-reversal symmetric insulators are classified by a $\mathbb{Z}{2}$ topological invariant. Usually, the invariant is introduced and calculated by exploiting the way time-reversal symmetry acts in reciprocal space, hence implicitly assuming periodicity and homogeneity. Here, we introduce two space-resolved $\mathbb{Z}{2}$ topological markers that are able to probe the local topology of the ground-state electronic structure also in the case of inhomogeneous and finite systems. The first approach leads to a generalized local spin-Chern marker, that usually remains well-defined also when the perpendicular component of the spin, $S_{z}$, is not conserved. The second marker is solely based on time-reversal symmetry, hence being more general. We validate our markers on the Kane-Mele model both in periodic and open boundary conditions, also in presence of disorder and including topological/trivial heterojunctions.

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