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cond-mat.mes-hall2026
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…
cond-mat.mes-hall2026
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…
cond-mat.mes-hall2024
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…