We study the scattering problem for the non-Hermitian scattering center, which consists of two Hermitian clusters with anti-Hermitian couplings between them. Counterintuitively, it is shown that it acts as a Hermitian scattering center, satisfying $|r| ^{2}+|t| ^{2}=1$, i.e., the Dirac...
In the open systems, the effects of the continuum decay channels are accounted for by indirect non-Hermitian couplings among the quasibound states. Here we explore anti-Hermitian coupling in a plasmonic system for spatially manipulating light on the nanoscale. We show that by utilizing the anti-...
This change of paradigm allows one to understand topological transitions and the emergence of zero modes in more general systems than can be described by band topology. This is achieved by studying exceptional point bifurcations in the complex spectrum of the system’s non-Hermitian Hamiltonian. ...
However, in non-Hermitian systems, where the eigenfrequencies are complex, the spectrum may return to itself in a topologically non-trivial manner, a phenomenon known as spectral flow. The spectral flow is determined by how the control loop encircles degeneracies, and this relationship is well ...
题目:Quantum Non-Hermitian Phenomena with Open Baths | 北京大学量子材料科学中心 时间:2024-04-17 15:00 报告人:胡颖 山西大学 主办方:北京大学量子材料科学中心 直播链接:蔻享学术 摘要:While enchanti…
We also show that the non-Hermitian topological edge modes can be realized in a honeycomb-like lattice of ring resonators with non-Hermitian couplings. 展开 DOI: 10.1103/PhysRevLett.118.040401 被引量: 31 年份: 2016 收藏 引用 批量引用 报错 分享 ...
Non-Hermitian photonics and topological photonics, as new research fields in optics, have attracted much attention in recent years, accompanying by a great deal of new physical concepts and novel effects emerging. The two fields are gradually crossed dur
(the potential is safely confining at g > 0) and computational tractability. In this letter, we intend to join the effort of studying these models in a non-self-adjoint regime [1]. While the construction of the solutions becomes fairly easy in perturbative framework [2,3], a ...
In addition, non-Hermitian asymmetric couplings are induced in elliptical waveguides, which stem from the interaction between synthetical gauge fields and dissipation. By increasing the ellipticity of wave -guides, the degree of asymmetric coupling increases, and the system experiences a phase transition...
We study the properties of Bose–Einstein condensates under a non-Hermitian spin–orbit coupling(SOC), induced by a dissipative two-photon Raman process. We focus on the dynamics of the condensate at short times, when the impact of decoherence induced by quantum jumps is negligible and the ...