论文标题
由转换光学器件构建的伪热系统，具有稳健平衡的损失和增益
Pseudo-Hermitian Systems Constructed by Transformation Optics with Robustly Balanced Loss and Gain
论文作者
论文摘要
已经发现具有平等时间对称性的非热系统具有特征值的真实光谱，表明损失和增益之间存在平衡。但是，这种平衡不仅取决于损失和增益的幅度，而且由于外部干扰而容易破坏。在这里，作者提出了一种转化 - 揭示方法，以构建具有稳健平衡损失和增益的独特类型的非热门系统，而不论损失/增益的幅度和环境干扰的幅度如何。通过转换 - 启示操作员，例如空间折叠和拉伸，可以在真实空间中产生和分离。在虚拟空间中，损失和增益仍然相互结合，使能量平衡比其他非官方系统更强大。有限元模拟验证了这一惊人的功能。这项工作揭示了一类非热门系统，在这些系统中，损失和增益具有稳健的平衡，从而表示为伪缓冲系统。
Non-Hermitian systems with parity-time symmetry have been found to exhibit real spectra of eigenvalues, indicating a balance between the loss and gain. However, such a balance is not only dependent on the magnitude of loss and gain, but also easily broken due to external disturbance. Here, the authors propose a transformation-optics approach to construct a unique class of non-Hermitian systems with robustly balanced loss and gain, irrespective of the magnitude of loss/gain and the environmental disturbance. Through transformation-optics operators like space folding and stretching, loss and gain can be generated and separated in the real space. While in the virtual space, the loss and gain are still combined to each other, rendering a balance of energy that is far more robust than other non-Hermitian systems. This amazing feature is verified by finite-element simulations. This work reveals a class of non-Hermitian systems in which loss and gain are balanced robustly, thereby denoted as pseudo-Hermitian systems.
