Edge ${\mathbb{Z}}_3$ parafermions in fermionic lattices

Abstract

Parafermions modes are non-Abelian anyons which were introduced as ${\mathbb{Z}}_N$ generalizations of ${\mathbb{Z}}_2$ Majorana states. In particular, ${\mathbb{Z}}_3$ parafermions can be used to produce Fibonacci anyons, laying a path towards universal topological quantum computation. Due to their fractional nature, much of theoretical work on ${\mathbb{Z}}_3$ parafermions has relied on bosonization methods or parafermionic quasi-particles. In this work, we introduce a representation of ${\mathbb{Z}}_3$ parafermions in terms of purely fermionic models operators in the t-J regime. We establish the equivalency of a family of lattice fermionic models written in the $t-J$ model basis with a Kitaev-like chain supporting free ${\mathbb{Z}}_3$ parafermonic modes at its ends. By using density matrix renormalization group calculations, we are able to characterize the topological phase transition and study the effect of local operators (doping and magnetic fields) on the spatial localization of the parafermionic modes and their stability. Moreover, we discuss the necessary ingredients towards realizing ${\mathbb{Z}}_3$ parafermions in strongly interacting electronic systems.

arXiv commentPublished version

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• Interaction-induced strong zero modes in short quantum dot chains with time-reversal symmetry
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