期刊
PHYSICAL REVIEW LETTERS
卷 105, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.226401
关键词
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资金
- Alfred P. Sloan Foundation
- NSF [DMR-0840965]
- Swiss NSF
- DARPA QuEST
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0840965] Funding Source: National Science Foundation
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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