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math.SP2026
Topologically protected interface modes in multi-band damped lattice models
Yannick de Bruijn, Erik Orvehed Hiltunen
Tridiagonal -Toeplitz operators provide a natural framework for modelling one-dimensional -periodic lattice systems. A fundamental connection is obtained between Coburn's lem…
math.SP2026
Mathematical Foundation for the Generalised Brillouin zone of m-banded Toeplitz operators
Yannick de Bruijn, Erik Orvehed Hiltunen
We show that the spectrum of the open-boundary limit of banded Toeplitz matrices is real whenever the associated symbol function is real-valued along a closed polar curve. Building…