| Autor: |
Jukka I. Väyrynen, Adrian E. Feiguin, Roman M. Lutchyn |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
Physical Review Research, Vol 2, Iss 4, p 043228 (2020) |
| Druh dokumentu: |
article |
| ISSN: |
2643-1564 |
| DOI: |
10.1103/PhysRevResearch.2.043228 |
| Popis: |
We consider a mesoscopic superconducting island hosting multiple pairs of Majorana zero-energy modes. The Majorana island consists of multiple p-wave wires connected together by a trivial (s-wave) superconducting backbone and is characterized by an overall charging energy E_{C}; the wires are coupled to normal-metal leads via tunnel junctions. We calculate the average charge on the island as well as nonlocal conductance matrix as a function of a p-wave pairing gap Δ_{P}, charging energy E_{C}, and dimensionless junction conductances g_{i}. We find that the presence of a topological ground-state degeneracy in the island dramatically enhances charge fluctuations and leads to the suppression of Coulomb blockade effects. In contrast with conventional (s-wave) mesoscopic superconducting islands, we find that Coulomb blockade oscillations of conductance are suppressed in Majorana islands regardless of the ratio E_{C}/Δ_{P} or the magnitude of the conductances g_{i}. We also discuss our findings in relation to the so-called topological Kondo effect. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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