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

Thakurathi, Manisha and Chevallier, Denis and Loss, Daniel and Klinovaja, Jelena. (2020) Transport signatures of bulk topological phases in double Rashba nanowires probed by spin-polarized STM. Physical Review Research, 2 (2). 023197.

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Official URL: https://edoc.unibas.ch/80701/

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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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretical Nano/Quantum Physics (Klinovaja)
UniBasel Contributors:Klinovaja, Jelena
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
e-ISSN:2643-1564
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:20 Apr 2021 15:33
Deposited On:20 Apr 2021 14:56

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