论文标题
通过调整高阶特殊点来增强灵敏度的双向增强
Two-way enhancement of sensitivity by tailoring higher-order exceptional points
论文作者
论文摘要
在非炎热系统中，高阶特殊点最近被用作设计高敏化设备的工具，引起了多学科领域的极大关注。在这里，我们提出了一个简单而有效的方案，可以通过将增益中性损失线性构型稍微偏离三角形，从而增强设备灵敏度，从而导致从三阶到二阶特异点突然过渡。我们的分析表明，可以通过对系统的耦合参数进行明智的调整来量身定制特殊点，从而提高对小扰动的敏感性。可调耦合还导致灵敏度斜率发生急剧变化，从而使扰动能够准确地测量作为耦合的函数。这种对扰动的两向检测为超敏感的测量带来了丰富的景观，这可能适用于广泛的非炎性三元平台。
Higher-order exceptional points in non-Hermitian systems have recently been used as a tool to engineer high-sensitivity devices, attracting tremendous attention from multidisciplinary fields. Here, we present a simple yet effective scheme to enhance the device sensitivity by slightly deviating the gain-neutral-loss linear configuration to a triangular one, resulting in an abrupt phase transition from third-order to second-order exceptional points. Our analysis demonstrates that the exceptional points can be tailored by a judicious tuning of the coupling parameters of the system, resulting in enhanced sensitivity to a small perturbation. The tunable coupling also leads to a sharp change in the sensitivity slope, enabling the perturbation to be measured precisely as a function of coupling. This two-way detection of the perturbation opens up a rich landscape toward ultra-sensitive measurements, which could be applicable to a wide range of non-Hermitian ternary platforms.
