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Arbitrarily configurable nonlinear topological modes
- 发表刊物：Physical Review Letters
- 摘要：Topological modes (TMs) are typically localized at boundaries, interfaces and dislocations, and
exponentially decay into the bulk of a large enough lattice. Recently, the non-Hermitian skin
effect has been leveraged to delocalize the wavefunctions of TMs from the boundary and thus
to increase the capacity of TMs dramatically. Here, we explore the capability of nonlinearity in
designing and reconfiguring the wavefunctions of TMs. With growing intensity, wavefunctions of
these in-gap nonlinear TMs undergo an initial deviation from exponential decay, gradually merge
into arbitrarily designable plateaus, then encompass the entire nonlinear domain, and eventually
concentrate at the nonlinear boundary. Intriguingly, such extended nonlinear TMs are still robust
against defects and disorders, and stable in dynamics under external excitation. Advancing the
conceptual understanding of the nonlinear TMs, our results open new avenues for increasing the
capacity of TMs and developing compact and reconfigurable topological devices.
- 卷号：133
- 期号：11
- 页面范围：116602
- 是否译文：否
- 发表时间：2024-09-13
