Phase diagram of the $Z_3$ Parafermionic Chain with Chiral Interactions

Abstract

Parafermions are exotic quasiparticles with non-Abelian fractional statistics that can be realized and stabilized in 1-dimensional models that are generalizations of the Kitaev p-wave wire. We study the simplest generalization, i.e. the $Z_3$ parafermionic chain. Using a Jordan-Wigner transform we focus on the equivalent three-state chiral clock model, and study its rich phase diagram using the density matrix renormalization group technique. We perform our analyses using quantum entanglement diagnostics which allow us to determine phase boundaries, and the nature of the phase transitions. In particular, we study the transition between the topological and trivial phases, as well as to an intervening incommensurate phase which appears in a wide region of the phase diagram. The phase diagram is predicted to contain a Lifshitz type transition which we confirm using entanglement measures. We also attempt to locate and characterize a putative tricritical point in the phase diagram where the three above mentioned phases meet at a single point.

6 pages, 4 figures; 4 pages of supplemental material

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• Parafermionic wires at the interface of chiral topological states
• Tunable Splitting of the Ground-State Degeneracy in 1D Parafermionic Wires
• Localization-protected order in spin chains with non-Abelian discrete symmetries
• Exact results for a $Z_3$ clock-type model and some close relatives
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• Families of Gapped Interfaces Between Fractional Quantum Hall States
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• Energy transport in Z3 chiral clock model