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• W2912161256 abstract "We systematically investigate the finite-size effects in non-Hermitian one-dimensional Su-Schrieffer-Heeger (SSH) and two-dimensional (2D) Chern insulator models. In the Hermitian SSH system, the finite-size energy gap is always real and shows a monotonic-exponential decay as the chain length grows. In contrast, for the non-Hermitian SSH model, the non-Hermitian intracell hoppings can modify the localization lengths of bulk and end states, giving rise to a complex finite-size energy gap that exhibits an oscillating exponential decay as the chain length grows. However, the imaginary staggered onsite potentials in the SSH model only change the end-state energy, leaving the localization lengths of the system unchanged. In this case, the finite-size energy gap can undergo a transition from real values to imaginary values. We observed similar phenomena for the finite-size effect in 2D non-Hermitian Chern insulator systems." @default.
• W2912161256 created "2019-02-21" @default.
• W2912161256 creator A5016182830 @default.
• W2912161256 creator A5051590556 @default.
• W2912161256 creator A5053453125 @default.
• W2912161256 creator A5068241362 @default.
• W2912161256 date "2019-04-29" @default.
• W2912161256 modified "2023-10-16" @default.
• W2912161256 title "Finite-size effects in non-Hermitian topological systems" @default.
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• W2912161256 doi "https://doi.org/10.1103/physrevb.99.155431" @default.

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