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math.FA2020
Kippenhahn curves of some tridiagonal matrices
Natália Bebiano, Joáo da Providéncia, Ilya M. Spitkovsky +1
Tridiagonal matrices with constant main diagonal and reciprocal pairs of off-diagonal entries are considered. Conditions for such matrices with sizes up to 6-by-6 to have elliptica…
quant-ph2020
A quantum system with a non-Hermitian Hamiltonian
Natália Bebiano, João da Providência, S. Nishiyama +1
The relevance in Physics of non-Hermitian operators with real eigenvalues is being widely recognized not only in quantum mechanics but also in other areas, such as quantum optics,…