Criticality in the Crossed Andreev Reflection of a Quantum Hall Edge

We develop a theory of the nonlocal transport of two counterpropagating ν=1 quantum Hall edges coupled via a narrow disordered superconductor. Contrary to the predictions developed for the clean case, the edge states proximitized in this way do not turn into a topological superconductor. Instead, th...

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Veröffentlicht in:Physical review. X 2023-09, Vol.13 (3), p.031027, Article 031027
Hauptverfasser: Kurilovich, Vladislav D., Glazman, Leonid I.
Format: Artikel
Sprache:eng
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Zusammenfassung:We develop a theory of the nonlocal transport of two counterpropagating ν=1 quantum Hall edges coupled via a narrow disordered superconductor. Contrary to the predictions developed for the clean case, the edge states proximitized in this way do not turn into a topological superconductor. Instead, they are naturally tuned to the critical point between trivial and topological phases. This occurs due to the competition between tunneling processes with and without particle-hole conversion. The critical conductance is a random, sample-specific quantity with a zero average and unusual bias dependence. The negative values of conductance are relatively stable against variations of the carrier density, which may make the critical state appear as a topological one. Our results offer an interpretation of recent experiments [G.-H. Lee et al., Nat. Phys. 13, 693 (2017)NPAHAX1745-247310.1038/nphys4084; O. Gül et al., Phys. Rev. X 12, 021057 (2022)PRXHAE2160-330810.1103/PhysRevX.12.021057].
ISSN:2160-3308
2160-3308
DOI:10.1103/PhysRevX.13.031027