Superconducting p-wave pairing effects on one-dimensional non-Hermitian quasicrystals with power law hopping

Shaina Gandhi; Jayendra N. Bandyopadhyay

doi:10.1103/PhysRevB.111.174210

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Superconducting p-wave pairing effects on one-dimensional non-Hermitian quasicrystals with power law hopping

Shaina Gandhi, Jayendra N. Bandyopadhyay

DOI 10.1103/PhysRevB.111.174210 · Physical Review B

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Abstract

We study the effects of superconducting p-wave pairing on the non-Hermitian Aubry-André-Harper model with power-law hopping. For the case of short-range hopping, weak pairing leads to oscillating quasi-Majorana zero modes, turning to edge-localized Majorana zero modes as pairing strength increases. For the case of long-range hopping, we observe the emergence of massive Dirac modes having oscillatory behavior, similar to Majorana modes with weak pairing. The massive Dirac modes localize at the edges as the pairing strength grows. The superconducting pairing spoils the plateaus observed in the fractal dimension of all the energy eigenstates of the Aubry-André-Harper model with power-law hopping. The number of plateaus decreases with the increasing pairing strength for the weak non-Hermiticity in the system. The phase diagram of the system reveals that real and complex energy spectra correlate differently with the localization properties of the eigenstates, depending on the strength of pairing and hopping range.