Measuring Majorana nonlocality and spin structure with a quantum dot
By E. Prada, R. Aguado, Pablo Perez San-José. 2017
168 citations recorded by the source corpus.
Robust zero-bias transport anomalies in semiconducting nanowires with proximity-induced superconductivity have been convincingly demonstrated in various experiments. While these are compatible with the existence of Majorana zero modes at the ends of the nanowire, a direct proof of their nonlocality and topological protection is now needed. Here we show that a quantum dot at the end of the nanowire may be used as a powerful spectroscopic tool to quantify the degree of Majorana nonlocality through a local transport measurement. Moreover, the spin polarization of dot subgap states at singlet-doublet transitions in the Coulomb blockade regime allows the dot to directly probe the spin structure of the Majorana wave function and indirectly measure the spin-orbit coupling of the nanowire.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/a40cde457fa6045fee14b9e5642f5829b2f37ac2
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In Atomic and Molecular Physics, and Optics
In Condensed Matter Physics
Citations in the corpus
- Reproducing topological properties with quasi-Majorana states (2018, methodology): “Figure 2(b) shows the second system, a coupled quantum dot-nanowire device, which has been proposed recently as an additional tool for measuring the non-locality of Majorana states [26,27].”
- Nonlocality of Majorana modes in hybrid nanowires (2017, methodology): “A comparison to microscopic models indicates [30] that in the topological regime, the dimensionless quantity η = √ tR/tL accurately estimates the overlap, Ω ≈ η, under generic conditions.”