14 citations · 28 across the 7 of their papers we have counts for
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math-ph2015★ 2 cited
Non-linear eigenvalue problems and applications to photonic crystals
Christian Engström, Heinz Langer, Christiane Tretter
We establish new analytic and numerical results on a general class of rational operator Nevanlinna functions that arise e.g. in modelling photonic crystals. The capability of these…
math-ph2010★ 12 cited
On the spectrum of the magnetohydrodynamic mean-field alpha^2-dynamo operator
Uwe Guenther, Heinz Langer, Christiane Tretter
The existence of magnetohydrodynamic mean-field alpha^2-dynamos with spherically symmetric, isotropic helical turbulence function alpha is related to a non-self-adjoint spectral pr…