Cooper-pair injection into quantum spin hall insulators

Koji Sato, Daniel Loss, Yaroslav Tserkovnyak

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

We theoretically study tunneling of Cooper pairs from a superconductor spanning a two-dimensional topological insulator strip into its helical edge states. The coherent low-energy electron-pair tunneling sets off positive current cross correlations along the edges, which reflect an interplay of two quantum-entanglement processes. Most importantly, superconducting spin pairing dictates a Cooper pair partitioning into the helical edge liquids, which transport electrons in opposite directions for opposite spin orientations. At the same time, Luttinger-liquid correlations fractionalize electrons injected at a given edge into counterpropagating charge pulses carrying definite fractions of the elementary electron charge.

Original languageEnglish
Article number226401
JournalPhysical Review Letters
Volume105
Issue number22
DOIs
Publication statusPublished - 2010 Nov 22
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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