Enhanced energy harvesting near exceptional points in systems with (pseudo-)PT-symmetry
Enhanced energy harvesting near exceptional points in systems with (pseudo-)PT-symmetry
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DOI：
10.1038/s42005-021-00577-5
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发表时间：
2021-04-21
影响因子：
5.5
通讯作者：
Kottos, Tsampikos
中科院分区：
文献类型：
--
作者：
Fernandez-Alcazar, Lucas J.;Kononchuk, Rodion;Kottos, Tsampikos
异常点简并，发生在非厄米特系统，已经挑战了许多既定的概念，并导致显着的技术的发展。在这里，我们提出了一个家庭的自主电机，其操作原理依赖于例外点通过适当的实施（伪）PT对称性及其自发或明确的违反。这些电机表现出高效率和最大工作共存的参数域。在光子框架中，它们可以通过来自环境热库的热辐射来推进，并用作自主自供电的微型机器人，或用作生物环境中微流体的微型泵。同样的设计也可以用机电元件来实现，用于收集周围的机械（例如，振动）噪声，用于为各种辅助系统提供动力。我们希望我们的建议将有助于通过引入数学和非厄米波动物理学的概念的能量收集的研究议程。优化能量收集是相关的各种微和纳米技术的应用范围从自供电的纳米设备到微流体泵在生物环境中。在这里，作者表明，一个巧妙设计的光（/电）-机械电路可以同时表现出高效率和功率生产时，通过伪PT对称性实现的异常点简并附近操作。
Exceptional point degeneracies, occurring in non-Hermitian systems, have challenged many well established concepts and led to the development of remarkable technologies. Here, we propose a family of autonomous motors whose operational principle relies on exceptional points via the opportune implementation of a (pseudo-)PT-symmetry and its spontaneous or explicit violation. These motors demonstrate a parameter domain of coexisting high efficiency and maximum work. In the photonic framework, they can be propelled by thermal radiation from the ambient thermal reservoirs and utilized as autonomous self-powered microrobots, or as micro-pumps for microfluidics in biological environments. The same designs can be also implemented with electromechanical elements for harvesting ambient mechanical (e.g., vibrational) noise for powering a variety of auxiliary systems. We expect that our proposal will contribute to the research agenda of energy harvesting by introducing concepts from mathematical and non-Hermitian wave physics.Optimising energy harvesting is relevant to a variety of micro and nanotechnologies with applications ranging from self powered nanodevices to microfluidic pumps in biological environments. Here, the authors show that an opportunely designed opto(/electro)-mechanical circuit can simultaneously demonstrate high efficiency and power production when operating in the vicinity of an exceptional point degeneracy implemented via a pseudo-PT symmetry.