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math.GM2021
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…
cond-mat.mes-hall2021
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…