Transport signatures of topological phases in double nanowires probed by spin-polarized STM

Abstract

We study a double-nanowire setup proximity coupled to an $s$-wave superconductor and search for the bulk signatures of the topological phase transition that can be observed experimentally, for example, with an STM tip. Three bulk quantities, namely, the charge, the spin polarization, and the pairing amplitude of intrawire superconductivity are studied in this work. The spin polarization and the pairing amplitude flip sign as the system undergoes a phase transition from the trivial to the topological phase. In order to identify promising ways to observe bulk signatures of the phase transition in transport experiments, we compute the spin current flowing between a local spin-polarized probe, such as an STM tip, and the double-nanowire system in the Keldysh formalism. We find that the spin current contains information about the sign flip of the bulk spin polarization and can be used to determine the topological phase transition point.

12 pages, 7 figures

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Cited by in corpus (8)

• Quadrupole spin polarization as signature of second-order topological superconductors
• Josephson junctions in double nanowires bridged by in-situ deposited superconductors
• Non-Hermitian higher-Order Weyl semimetal with surface diabolic points
• Spin-orbital polarization of Majorana edge states in oxides nanowires
• Majorana bound states in topological insulators with hidden Dirac points
• Tunable Josephson diode effect in singlet superconductor-altermagnet-triplet superconductor junctions
• Unconventional topological transitions in a self-organized magnetic ladder
• Electronic transport in double-nanowire superconducting islands with multiple terminals