Generalized Aubry-André-Harper model with p-wave superconducting pairing

Abstract

We investigate a generalized Aubry-André-Harper (AAH) model with p-wave superconducting pairing. Both the hopping amplitudes between the nearest neighboring lattice sites and the on-site potentials in this system are modulated by a cosine function with a periodicity of $1/\alpha$. In the incommensurate case [$\alpha =(\sqrt{5}-1)/2$], due to the modulations on the hopping amplitudes, the critical region of this quasiperiodic system is significantly reduced and the system becomes more easily to be turned from extended states to localized states. In the commensurate case ($\alpha =1/2$), we find that this model shows three different phases when we tune the system parameters: Su-Schrieffer-Heeger (SSH)-like trivial, SSH-like topological, and Kitaev-like topological phases. The phase diagrams and the topological quantum numbers for these phases are presented in this work. This generalized AAH model combined with superconducting pairing provides us with a useful testfield for studying the phase transitions from extended states to Anderson localized states and the transitions between different topological phases.

9 pages, 5 figures

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• Anderson localization in Bose-Einstein condensates
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• Fermion Fractionalization to Majorana Fermions in Dimerized Kitaev Superconductor
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Cited by in corpus (5)

• Characterization of topological phases of modified dimerized Kitaev chain via edge correlation functions
• Exact solution to an interacting dimerized Kitaev model at symmetric point
• Line nodes and surface Majorana flat bands in static and kicked p-wave superconducting Harper model
• Phase diagram of a generalized off-diagonal Aubry-André model with p-wave pairing
• Polynomial description of inhomogeneous topological superconducting wires