Issue |
EPL
Volume 102, Number 5, June 2013
|
|
---|---|---|
Article Number | 57002 | |
Number of page(s) | 5 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/102/57002 | |
Published online | 20 June 2013 |
Majorana states in a p-wave superconducting ring
1 Department of Electrophysics, National Chiao Tung University - Hsinchu, Taiwan, ROC
2 Physics Department, Ariel University Center of Samaria - Ariel 40700, Israel
3 Department of Physics, Institute of Superconductivity, Bar-Ilan University - Ramat-Gan 52900, Israel
Received: 6 December 2012
Accepted: 11 May 2013
The spectrum of excitations of the chiral superconducting ring with internal and external radii Ri, Re (comparable with coherence length ξ) trapping a unit flux Φ0 is calculated. We find within the Bogoliubov-de Gennes approach that there exists a pair of precisely zero-energy states when 2k⊥(Re − Ri)/π is integer (here k⊥ is the momentum component in the disk plane while k⊥ξ > 1). They are not protected by topology, but are stable under certain deformations of the system. We discuss the ways to tune the system so that it grows into such a “Majorana disk”. This condition has a character of a resonance phenomenon.
PACS: 74.20.Rp – Pairing symmetries (other than s-wave)
© EPLA, 2013
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