Hidden chiral symmetries in BDI multichannel Kitaev chains. (4th April 2018)

• Record Type: Journal Article
• Authors: Manesco, Antônio L R; Weber, Gabriel; Rodrigues, Durval
• Is Part Of: Journal of physics. Volume 30:Number 17(2018)
• Publication Date: 2018-04-04
• Subjects: topological superconductivity -- Kitaev chain -- chiral symmetry -- winding number -- multiband superconductivity; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aab722
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: Realistic implementations of the Kitaev chain require, in general, the introduction of extra internal degrees of freedom. In the present work, we discuss the presence of hidden BDI symmetries for free Hamiltonians describing systems with an arbitrary number of internal degrees of freedom. We generalize results of a spinfull Kitaev chain to construct a Hamiltonian with n internal degrees of freedom and obtain the corresponding hidden chiral symmetry. As an explicit application of this generalized result, we exploit by analytical and numerical calculations the case of a spinful two-band Kitaev chain, which can host up to four Majorana bound states. We also observe the appearence of minigap states, when chiral symmetry is broken.