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  • Title: Cooper-pair injection into quantum spin Hall insulators.
    Author: Sato K, Loss D, Tserkovnyak Y.
    Journal: Phys Rev Lett; 2010 Nov 26; 105(22):226401. PubMed ID: 21231401.
    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.
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