Abstract
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 - R i)/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.
Original language | English |
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Article number | 57002 |
Journal | EPL |
Volume | 102 |
Issue number | 5 |
DOIs | |
State | Published - 1 Jun 2013 |