341 citations · 2.7k across the 51 of their papers we have counts for
51 papers
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…
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…
Moving along an exceptional surface towards a higher-order exceptional point
Jan Wiersig
Open systems with non-Hermitian degeneracies called exceptional points show a significantly enhanced response to perturbations in terms of large energy splittings induced by a smal…
Petermann factors and phase rigidities near exceptional points
Jan Wiersig
The Petermann factor and the phase rigidity are convenient measures for various aspects of open quantum and wave systems, such as the sensitivity of energy eigenvalues to perturbat…
Coherent Perfect Absorption in Chaotic Optical Microresonators for Efficient Modal Control
Xuefeng Jiang, Shixiong Yin, Huanan Li +5
Non-Hermitian wave engineering has attracted a surge of interest in photonics in recent years. One of the prominent phenomena is coherent perfect absorption (CPA), in which the ann…
Revisiting the hierarchical construction of higher-order exceptional points
Jan Wiersig
Higher-order exceptional points in the spectrum of non-Hermitian Hamiltonians describing open quantum or wave systems have a variety of potential applications in particular in opti…