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28 March 2024
 
  » arxiv » cond-mat/9909426

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Fermion zero modes on vortices in chiral superconductors
G.E. Volovik ;
Date 29 Sep 1999
Journal Pisma Zh.Eksp.Teor.Fiz. 70 (1999) 601-606; JETP Lett. 70 (1999) 609-614
Subject cond-mat hep-ph
AbstractThe energy levels of the fermions bound to the vortex core are considered for the general case of chiral superconductors. There are two classes of chiral superconductivity: in the superconducting state of class I the axisymmetric singly quantized vortex has the same energy spectrum of bound states as in s-wave superconductor: E=(n+1/2)omega_0 with integral n. In the class II the corresponding spectrum is E=nomega_0 and thus contains the state with exactly zero energy. The effect of a single impurity on the spectrum of bound state is also considered. For the class I the spectrum acquires the double period Delta E=2omega_0 and consists of two equidistant sets of levels in accordance with A.I. Larkin and Yu.N. Ovchinnikov, Phys. Rev. B57 (1998) 5457. The spectrum is not influenced by a single impurity if the same approximation is applied for vortices in the class II superconducting states.
Source arXiv, cond-mat/9909426
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