Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 34, Issue 17, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-648X/ac4f1e
Keywords
superconductors; majorana zero modes; topological phase transitions; Berry monopoles
Categories
Funding
- National Natural Science Foundation of China [12074392, 12050410262]
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This work demonstrates how to characterize topological phase transitions in BDI symmetry class superconductors using the approach of Berry singularity markers. The author applies this method to the Kitaev chain model and identifies pairs of external fields that can detect the topological charges of the Berry singularities responsible for the phase transitions.
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.
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