71 citations · 457 across the 24 of their papers we have counts for
24 papers
Equireflectionality and customized unbalanced coherent perfect absorption in asymmetric waveguide networks
Malte Röntgen, Olivier Richoux, Georgios Theocharis +4
We explore the scattering of waves in designed asymmetric one-dimensional waveguide networks. We show that the reflection between two ports of an asymmetric network can be identica…
Spectral Properties of Two Coupled Fibonacci Chains
Anouar Moustaj, Malte Röntgen, Christian V. Morfonios +2
The Fibonacci chain, i.e., a tight-binding model where couplings and/or on-site potentials can take only two different values distributed according to the Fibonacci word, is a clas…
Hidden symmetries in acoustic wave systems
Malte Röntgen, Christian V. Morfonios, Peter Schmelcher +1
Mirror symmetry of a wave system imposes corresponding even or odd parity on its eigenmodes. For a discrete system, eigenmode parity on a specific subset of sites may also originat…
On symmetries of a matrix and its isospectral reduction
Malte Röntgen, Maxim Pyzh, Christian V. Morfonios +1
The analysis of diagonalizable matrices in terms of their so-called isospectral reduction represents a versatile approach to the underlying eigenvalue problem. Starting from a symm…
Flat bands by latent symmetry
C. V. Morfonios, M. Röntgen, M. Pyzh +1
Flat energy bands of model lattice Hamiltonians provide a key ingredient in designing dispersionless wave excitations and have become a versatile platform to study various aspects…
Latent symmetry induced degeneracies
M. Röntgen, M. Pyzh, C. V. Morfonios +3
Degeneracies in the energy spectra of physical systems are commonly considered to be either of accidental character or induced by symmetries of the Hamiltonian. We develop an appro…