Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.106801
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Funding
- Deutsche Forschungsgemeinschaft [SPP1285, SPP1666]
- Humboldt Foundation
- NSF DMR Grant [1206612]
- ONR Grant [Q00704]
- NSF [PHYS-106629]
- Helmholtz Virtual Institute New states of matter and their excitations
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1206612] Funding Source: National Science Foundation
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A recent experiment [Nadj-Perge et al, Science 346, 602 (2014)] gives possible evidence for Majorana bound states in chains of magnetic adatoms placed on a superconductor. While many features of the observed end states are naturally interpreted in terms of Majorana states, their strong localization remained puzzling. We consider a linear chain of Anderson impurities on a superconductor as a minimal model and treat it largely analytically within mean-field theory. We explore the phase diagram, the subgap excitation spectrum, and the Majorana wave functions. Owing to a strong velocity renormalization, the latter are localized on a scale which is parametrically small compared to the coherence length of the host superconductor.
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