Anomalous localization enhancement in one-dimensional non-Hermitian disordered lattices

Abstract

We study numerically the localization properties of eigenstates in a one-dimensional random lattice described by a non-Hermitian disordered Hamiltonian, where both the disorder and the non-Hermiticity are inserted simultaneously in the on-site potential. We calculate the averaged participation number, the Shannon entropy and the structural entropy as a function of other parameters. We show that, in the presence of an imaginary random potential, all eigenstates are localized in the thermodynamic limit and strong anomalous Anderson localization occurs at the band center. In contrast to the usual localization anomalies where a weaker localization is observed, the localization of the eigenstates near the band center is strongly enhanced in the present non-Hermitian model. This phenomenon is associated with the occurrence of a large number of strongly-localized states with pure imaginary energy eigenvalues.

14 pages, 6 figures

References in corpus (4)

• Direct observation of Anderson localization of matter-waves in a controlled disorder
• Light Localization induced by Random Imaginary Permittivities
• Anomalous localisation in the aperiodic Kronig-Penney model
• Transport and localization of waves in ladder-shaped lattices with locally $\mathcal{P}\mathcal{T}$-symmetric potentials

Cited by in corpus (3)

• Probing Band-center Anomaly with the Kernel Polynomial Method
• Transport and localization properties of excitations in one-dimensional lattices with diagonal disordered mosaic modulations
• Numerical study of the transverse localization of waves in one-dimensional lattices with randomly distributed gain and loss: Effect of disorder correlations