Skin effect and dynamical delocalization in non-Hermitian quasicrystals with spin-orbit interaction

Abstract

The investigations of the spectral and dynamical delocalization-localization (DL) transition have revealed intriguing features in a wide range of non-Hermitian systems. The present study aims at exploring the spectral and dynamical properties in a non-Hermitian quasiperiodic system with asymmetric hopping in the presence of Rashba Spin-Orbit (RSO) interaction. In particular, in such systems, we have identified that the DL transition is associated with a concurrent change in the energy spectrum, where the eigenstates always break the time-reversal symmetry for all strenghts of the quasiperiodic potential, contrary to the systems without RSO interaction. Remarkably, we find that the reality of energy spectrum under the open boundary condition that is frequently symbolised as a hallmark of the skin-effect, is a system-size dependent phenomena, and appears even when the associated energies are indeed complex. In addition, it is demonstrated that the spin-flip term in the RSO interaction in fact possesses a tendency to diminish the directionality of the skin-effect. On scrutinizing the dynamical attributes in our non-Hermitian system, we unveil that in spite of the fact that the spectral DL transition accords with the dynamical phase transition, interestingly, the system comes across hyper-diffusive and negative diffusion dynamical regimes depending upon the strength of the RSO interaction, in the spectrally localized regime.

arXiv comment13 pages, 13 figures

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Cited by in corpus (5)

• Topological Non-Hermitian skin effect
• Emergent entanglement phase transitions in non-Hermitian Aubry-André-Harper chains
• Correlation-induced phase transitions and mobility edges in an interacting non-Hermitian quasicrystal
• Controlled probing of localization effects in the non-Hermitian Aubry-André model via topolectrical circuits
• Emergence of non-trivial phases in interacting non-Hermitian quasiperiodic chains with power-law hopping