Precursors to Topological Phase Transition in Topological Ladders

Seungju Han; Mahn-Soo Choi

doi:10.20944/preprints202311.1255.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 20 November 2023 / Approved: 20 November 2023 / Online: 20 November 2023 (16:15:50 CET)

We study the coupling of two topologcal subsystems in distinct topological states, and show that it leads to a precursor behavior of the topological phase transition in the overall system. This behavior is solely determined by the symmetry classes of the subsystem Hamiltonians and coupling terms, and is marked by the persistent existence of subgap states within the bulk energy gap. By investigating the critical current of Josephson junctions involving topological superconductors, we also illustrate that such subgap states play crucial roles in physical properties of nanoscale devices or materials.

topological insulator; topological supercondcutors; zero-energy edge states; suggap states

Physical Sciences, Condensed Matter Physics

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Precursors to Topological Phase Transition in Topological Ladders

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