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quant-ph2024
Graph-theoretical approach to the eigenvalue spectrum of perturbed higher-order exceptional points
Daniel Grom, Julius Kullig, Malte Röntgen +1
Exceptional points are special degeneracy points in parameter space that can arise in (effective) non-Hermitian Hamiltonians describing open quantum and wave systems. At an n-th or…
physics.comp-ph2024★ 10 cited
Computing eigenfrequency sensitivities near exceptional points
Felix Binkowski, Julius Kullig, Fridtjof Betz +4
Exceptional points are spectral degeneracies of non-Hermitian systems where both eigenfrequencies and eigenmodes coalesce. The eigenfrequency sensitivities near an exceptional poin…