Titlebook: Selected Papers of J. M. Burgers; F. T. M. Nieuwstadt,J. A. Steketee Book 1995 Springer Science+Business Media Dordrecht 1995 fluid.fluid

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Topological Semimetal Phase with Exceptional Points in One-dimensional Non-Hermitian Systems,neralized Brillouin zone is deformed so that the system remains gapless. It is also shown that each energy band is divided into three regions, depending on the symmetry of the eigenstates, and the regions are separated by the cusps and the exceptional points on the generalized Brillouin zone.