Diagnosing Topological Phase Transitions in 1D Superconductors using Berry Singularity Markers
arXiv:2112.03320 · doi:10.1088/1361-648X/ac4f1e
Abstract
In this work I demonstrate how to characterize topological phase transitions in BDI symmetry class superconductors (SCs) in 1D, using the recently introduced approach of Berry singularity markers (BSMs). In particular, I apply the BSM method to the celebrated Kitaev chain model, as well as to a variant of it, which contains both nearest and next nearest neighbor equal spin pairings. Depending on the situation, I identify pairs of external fields which can detect the topological charges of the Berry singularities which are responsible for the various topological phase transitions. These pairs of fields consist of either a flux knob which controls the supercurrent flow through the SC, or, strain, combined with a field which can tune the chemical potential of the system. Employing the present BSM approach appears to be within experimental reach for topological nanowire hybrids.
arXiv comment11 pages, 8 figures, follow-up of arXiv:2111.12957; Improved text and added one reference. Version accepted by Journal of Physics: Condensed Matter
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