137 citations · 768 across the 45 of their papers we have counts for
45 papers
Localization in microcavities revealed by phase-space non-Hermitian skin effect
Jung-Wan Ryu, Yong-Hoon Lee, Muhan Choi +2
Contrary to the semiclassical expectation for fully chaotic systems, localization of resonances is found to be a common feature in open microcavities. In spiral-shaped dielectric m…
Symmetry-protected flatband condition for Hamiltonians with local symmetry
Jung-Wan Ryu, Alexei Andreanov, Hee Chul Park +1
We derive symmetry-based conditions for tight-binding Hamiltonians with flatbands to have compact localized eigenstates occupying a single unit cell. The conditions are based on un…
Dynamics in non-Hermitian systems with nonreciprocal coupling
Jung-Wan Ryu
We reveal that non-Hermitian Hamiltonians with nonreciprocal coupling can achieve amplification of initial states without external gain due to a kind of inherent source. We discuss…
Exceptional Classifications of Non-Hermitian Systems
Jung-Wan Ryu, Jae-Ho Han, Chang-Hwan Yi +2
Eigenstate coalescence in non-Hermitian systems is widely observed in diverse scientific domains encompassing optics and open quantum systems. Recent investigations have revealed t…
Realization of Non-Hermitian Hopf Bundle Matter
Yung Kim, Hee Chul Park, Minwook Kyung +6
Line excitations in topological phases are a subject of particular interest because their mutual linking structures encode robust topological information of matter. It has been rec…
Comment on "Amplified emission and lasing in photonic time crystals"
Jagang Park, Hee Chul Park, Kyungmin Lee +5
Lyubarov et al. (Research Articles, 22 July 2022, p. 425) claim that the spontaneous emission rate of an atom vanishes at the momentum gap edges of photonic Floquet media. We show…