Hybrid exceptional point and its dynamical encircling in a two-state system
Hybrid exceptional point and its dynamical encircling in a two-state system
复制标题
两国体系中的混合特异点及其动力包围
DOI:
10.1103/physreva.98.033810
复制
发表时间:
2017-01
影响因子:
2.9
通讯作者:
Chan C. T.
中科院分区:
文献类型:
--
作者:
Zhang Xu Lin;Chan C. T.
Exceptional points are degeneracies in non-Hermitian systems. A two-state system with parity-time (PT) symmetry usually has only one exceptional point beyond which the eigenmodes are PT-symmetry broken. The so-called symmetry recovery, i.e., eigenmodes become PT-symmetric again, typically occurs in multi-state systems. Here we show that a two-state ferromagnetic waveguide system can have an exceptional point and a subsequent symmetry recovery due to the presence of accidental degeneracy points when the system is lossless. By introducing a parameter space where both exceptional points reside, we designed a system in which the trajectory in the parameter space can be controlled in situ using an adiabatically tunable external field, allowing us to explore the topological and chiral character of the system by encircling zero, one or two exceptional points. We performed microwave experiments to demonstrate the presence of the exceptional point, symmetry recovery, and the effects arising from their dynamical encircling.
登录
查看更多内容
影响因子:
8.6
作者:
Bender, CM;Boettcher, S
通讯作者:
Boettcher, S
影响因子:
8.6
作者:
Lumer, Yaakov;Plotnik, Yonatan;Segev, Mordechai
通讯作者:
Segev, Mordechai
影响因子:
3.6
作者:
N. Rivolta;B. Maes
通讯作者:
N. Rivolta;B. Maes
影响因子:
64.8
作者:
Gao, T.;Estrecho, E.;Ostrovskaya, E. A.
通讯作者:
Ostrovskaya, E. A.
影响因子:
8.6
作者:
Hassan, Absar U.;Zhen, Bo;Christodoulides, Demetrios N.
通讯作者:
Christodoulides, Demetrios N.