Enhancement of crossed Andreev reflection in a Kitaev ladder connected to normal metal leads

Ritu Nehra, Devendra Singh Bhakuni, Auditya Sharma, Abhiram Soori

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We study nonlocal transport in a two-leg Kitaev ladder connected to two normal metals. The coupling between the two legs of the ladder when the legs are maintained at a (large) superconducting phase difference, results in the creation of subgap Andreev states. These states in turn are responsible for the enhancement of crossed Andreev reflection (CAR). We find that tuning the different parameters of the system suitably leads to enhancement of CAR signalled by transconductance acquiring the most negative value possible. Furthermore, subgap states cause oscillations of the transconductance as a function of various system parameters such as chemical potential and ladder length, which are seen to be a consequence of Fabry-Pérot resonance.

Original languageEnglish
Article number345304
JournalJournal of Physics Condensed Matter
Volume31
Issue number34
DOIs
StatePublished - 1 Jan 2019
Externally publishedYes

Keywords

  • Andreev states
  • Kitaev chain
  • Majorana fermions
  • crossed Andreev reflection
  • superconducting ladder

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics

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