6 citations · 24 across the 12 of their papers we have counts for
12 papers
Mobile Exceptional Points Generate Momentum-Space Switching Domains
Jung-Wan Ryu, Chang-Hwan Yi
Exceptional points (EPs), non-Hermitian degeneracies where both eigenvalues and eigenvectors coalesce, play a central role in the topology of non-Hermitian spectra. Recent advances…
Biorthogonal scattering and generalized unitarity in non-Hermitian systems
Jung-Wan Ryu, Henning Schomerus, Hee Chul Park
We investigate the two-port scattering process in non-Hermitian dimer models via quantum measurements using external leads. We focus on two exemplary dimer models that preserve par…
Nonreciprocity induced spatiotemporal chaos: Reactive vs dissipative routes
Jung-Wan Ryu
Nonreciprocal interactions fundamentally alter the collective dynamics of nonlinear oscillator networks. Here we investigate Stuart-Landau oscillators on a ring with nonreciprocal…
A unified framework for exceptional point pairs in non-Hermitian two-level systems
Jung-Wan Ryu, Jae-Ho Han, Chang-Hwan Yi
Exceptional points (EPs) in non-Hermitian systems are branch singularities where eigenvalues and eigenvectors simultaneously coalesce, leading to rich topological phenomena beyond…
Non-orientable Exceptional Points in Twisted Boundary Systems
Jung-Wan Ryu, Jae-Ho Han, Moon Jip Park +2
Non-orientable manifolds, such as the Möbius strip and the Klein bottle, defy conventional geometric intuition through their twisted boundary conditions. As a result, topological d…
Decay Rates of Optical Modes Unveil the Island Structures in Mixed Phase Space
Chang-Hwan Yi, Barbara Dietz, Jae-Ho Han +1
We explore the decay rates of optical modes in asymmetric microcavities with mixed phase space across a wide range of wavelengths that extend deep into the semiclassical, i.e., sho…
Complex energy structures of exceptional point pairs in two level systems
Jung-Wan Ryu, Chang-Hwan Yi, Jae-Ho Han
We investigate the topological properties of multiple exceptional points in non-Hermitian two-level systems, emphasizing vorticity as a topological invariant arising from complex e…
Realization of geometric phase topology induced by multiple exceptional points
Jung-Wan Ryu, Jae-Ho Han, Chang-Hwan Yi
Non-Hermitian systems have Riemann surface structures of complex eigenvalues that admit singularities known as exceptional points. Combining with geometric phases of eigenstates gi…
Engineering high Chern number insulators
Sungjong Woo, Seungbum Woo, Jung-Wan Ryu +1
The concept of Chern insulators is one of the most important buliding block of topological physics, enabling the quantum Hall effect without external magnetic fields. The construct…
Pseudo-Hermitian Topology of Multiband Non-Hermitian Systems
Jung-Wan Ryu, Jae-Ho Han, Chang-Hwan Yi +2
The complex eigenenergies and non-orthogonal eigenstates of non-Hermitian systems exhibit unique topological phenomena that cannot appear in Hermitian systems. Representative examp…
Spontaneous emission decay and excitation in photonic time crystals
Jagang Park, Kyungmin Lee, Ruo-Yang Zhang +10
Over the last few decades, the predominant strategies for controlling spontaneous emission have involved tailoring the spatial surroundings of quantum emitters or atoms to create r…
Impact of non-Hermitian Mode interaction on Inter-cavity Light transfer
Hyeon-Hye Yu, Sunjae Gwak, Jinhyeok Ryu +4
Understanding inter-site mutual mode interaction in coupled physical systems is essential to comprehend large compound systems as this local interaction determines the successive m…