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Detection of Majorana Kramers Pairs Using a Quantum Point Contact

Author(s): Li, Jian; Pan, Wei; Bernevig, Bogdan A.; Lutchyn, Roman M

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Abstract: We propose a setup that integrates a quantum point contact (QPC) and a Josephson junction on a quantum spin Hall sample, experimentally realizable in InAs/GaSb quantum wells. The confinement due to both the QPC and the superconductor results in a Kramers pair of Majorana zero-energy bound states when the superconducting phases in the two arms differ by an odd multiple of p across the Josephson junction. We investigate the detection of these Majorana pairs with the integrated QPC, and find a robust switching from normal to Andreev scattering across the edges due to the presence of Majorana Kramers pairs. Such a switching of the current represents a qualitative signature where multiterminal differential conductances oscillate with alternating signs when the external magnetic field is tuned. We show that this qualitative signature is also present in current cross-correlations. Thus, the change of the backscattering current nature affects both conductance and shot noise, the measurement of which offers a significant advantage over quantitative signatures such as conductance quantization in realistic measurements.
Publication Date: 20-Jul-2016
Electronic Publication Date: 20-Jul-2016
Citation: Li, Jian, Pan, Wei, Bernevig, B Andrei, Lutchyn, Roman M. (2016). Detection of Majorana Kramers Pairs Using a Quantum Point Contact. PHYSICAL REVIEW LETTERS, 117 (10.1103/PhysRevLett.117.046804
DOI: doi:10.1103/PhysRevLett.117.046804
ISSN: 0031-9007
EISSN: 1079-7114
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW LETTERS
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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