首页|Localization Dynamics at the Exceptional Point of Non-Hermitian Creutz Ladder
Localization Dynamics at the Exceptional Point of Non-Hermitian Creutz Ladder
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We propose a quasi-one-dimensional non-Hermitian Creutz ladder with an entirely flat spectrum by intro-ducing alternating gain and loss components while maintaining inversion symmetry.Destructive interference generates a flat spectrum at the exceptional point,where the Creutz ladder maintains coalesced and degenerate eigenvalues with compact localized states distributed in a single plaquette.All excitations are completely confined within the localization area,unaffected by gain and loss.Single-site excitations exhibit nonunitary dynamics with intensities increasing due to level coalescence,while multiple-site excitations may display oscillating or constant intensities at the exceptional point.These results provide insights into the fascinating dynamics of non-Hermitian localization,where level coalescence and degeneracy coexist at the exceptional point.
张舒迈、何天毅、金亮
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School of Physics,Nankai University,Tianjin 300071,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of China
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