论文标题
高级手性和非甲状化皮肤效应
Higher rank chirality and non-Hermitian skin effect in a topolectrical circuit
论文作者
论文摘要
尽管在常规晶格系统中禁止手性失衡,但非热性可以有效地避免手性加倍定理以促进一维手性动力学。实际上,这样的系统支持不平衡的单向流,这可能导致在边界处的大量状态定位,称为非铁皮皮肤效应(NHSE)。最近,在Crystalline Systems中引入了一种具有分散$ω= k_ {x} k_ {y} $的2D鲁棒无间隙模式的广义(等级)手性。在这里,我们证明了等级2手性不平衡可以在非热(NH)晶格系统中确定,导致动量分辨的手性手性动力学,以及在边缘和角落占地的皮肤模式的等级-2 NHSE。然后,我们通过二维倒色电路实验测试这种现象学,该电路实现了NH Hamiltonian的长期列为2手性模式。使用阻抗测量值,我们确认了该系统中的等级-2 NHSE及其在预测的皮肤模式中的表现和高度不寻常的动量位置锁定响应。我们的研究表明,基于电路的路径探索高级手性物理,并在需要分辨率的系统中进行了潜在的应用,例如在波束形成器和非重点设备中。
While chirality imbalances are forbidden in conventional lattice systems, non-Hermiticity can effectively avoid the chiral-doubling theorem to facilitate 1D chiral dynamics. Indeed, such systems support unbalanced unidirectional flows that can lead to the localization of an extensive number of states at the boundary, known as the non-Hermitian skin effect (NHSE). Recently, a generalized (rank-2) chirality describing a 2D robust gapless mode with dispersion $ω=k_{x}k_{y}$ has been introduced in crystalline systems. Here we demonstrate that rank-2 chirality imbalances can be established in a non-Hermitian (NH) lattice system leading to momentum-resolved chiral dynamics, and a rank-2 NHSE where there are both edge- and corner-localized skin modes. We then experimentally test this phenomenology in a 2-dimensional topolectric circuit that implements a NH Hamiltonian with a long-lived rank-2 chiral mode. Using impedance measurements, we confirm the rank-2 NHSE in this system, and its manifestation in the predicted skin modes and a highly unusual momentum-position locking response. Our investigation demonstrates a circuit-based path to exploring higher-rank chiral physics, with potential applications in systems where momentum resolution is necessary, e.g., in beamformers and non-reciprocal devices.