Signatures of Majorana Zero Modes in Spin-Resolved Current Correlations

Abstract

We consider a normal lead coupled to a Majorana bound state. We show that the spin-resolved current correlations exhibit unique features which distinguish Majorana bound states from other low-energy resonances. In particular, the spin-up and spin-down currents from a Majorana bound state are anti-correlated at low bias voltages, and become uncorrelated at higher voltages. This behavior is independent of the exact form of coupling to the lead, and of the direction of the spin polarization. In contrast, an ordinary low-energy Andreev bound state gives rise to a positive correlation between the spin-up and spin-down currents, and this spin-resolved current-current correlation approaches a non-zero constant at high bias voltages. We discuss experimental setups in which this effect can be measured.

Published version, 5 pages + supplementary material

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Cited by in corpus (5)

• Distinguishing a Majorana zero mode using spin resolved measurements
• Weak measurement protocols for Majorana bound state identification
• Fingerprints of Majorana fermions in current-correlations measurements from a superconducting tunnel microscope
• Hanbury Brown and Twiss noise correlations in a topological superconductor beam splitter
• Multiple Andreev reflections in s-wave superconductor-quantum dot- topological superconductor tunnel junctions and Majorana bound states