论文标题
悬浮的微机械振荡器中的手性态转换,并具有对参数循环的原位控制
Chiral state conversion in a levitated micromechanical oscillator with in situ control of parameter loops
论文作者
论文摘要
具有增益和损失的物理系统可以用非热汉尔顿族人描述,该系统在特殊点(EPS)中退化。在非热门系统中探索了许多新的和意外的功能,最近有很多兴趣。最引人入胜的特征之一是,当一个EP动态围绕一个EP时,会出现手性状态转换。在这里,我们提出了一个容易控制的悬浮微颗粒系统,该系统携带一对EPS,并在参数平面中沿着回路实现哈密顿量的缓慢演变。利用可控旋转角,增益和损耗系数,我们可以控制环路的结构,大小和位置。我们证明,在能量表面和非绝热跃迁(NAT)的拓扑结构的联合作用下,手性行为既沿环绕EP的环,甚至沿着远离EP的直接路径出现。这项工作扩大了手性状态转换的参数空间范围,并提出了一个有用的平台来探索特殊点物理的有趣属性。
Physical systems with gain and loss can be described by a non-Hermitian Hamiltonian, which is degenerated at the exceptional points (EPs). Many new and unexpected features have been explored in the non-Hermitian systems with a great deal of recent interest. One of the most fascinating features is that, chiral state conversion appears when one EP is encircled dynamically. Here, we propose an easy-controllable levitated microparticle system that carries a pair of EPs and realize slow evolution of the Hamiltonian along loops in the parameter plane. Utilizing the controllable rotation angle, gain and loss coefficients, we can control the structure, size and location of the loops in situ. We demonstrate that, under the joint action of topological structure of energy surfaces and nonadiabatic transitions (NATs), the chiral behavior emerges both along a loop encircling an EP and even along a straight path away from the EP. This work broadens the range of parameter space for the chiral state conversion, and proposes a useful platform to explore the interesting properties of exceptional points physics.