End-to-end correlated subgap bound states are strong in a 300-nm hybrid nanowire and reduced by a factor of about four in a 900-nm device, quantified by a peak-based correlator and mutual information.
Coherent transport through a Majorana island in an Aharonov-Bohm interferometer
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abstract
Majorana zero modes are leading candidates for topological quantum computation due to non-local qubit encoding and non-abelian exchange statistics. Spatially separated Majorana modes are expected to allow phase-coherent single-electron transport through a topological superconducting island via a mechanism referred to as teleportation. Here we experimentally investigate such a system by patterning an elongated epitaxial InAs-Al island embedded in an Aharonov-Bohm interferometer. With increasing parallel magnetic field, a discrete sub-gap state in the island is lowered to zero energy yielding persistent 1e-periodic Coulomb blockade conductance peaks (e is the elementary charge). In this condition, conductance through the interferometer is observed to oscillate in a perpendicular magnetic field with a flux period of h/e (h is Planck's constant), indicating coherent transport of single electrons through the islands, a signature of electron teleportation via Majorana modes, could also be observed, suggesting additional non-Majorana mechanisms for 1e transport through these moderately short wires.
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cond-mat.mes-hall 1years
2019 1verdicts
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End-to-end correlated subgap states in hybrid nanowires
End-to-end correlated subgap bound states are strong in a 300-nm hybrid nanowire and reduced by a factor of about four in a 900-nm device, quantified by a peak-based correlator and mutual information.