Corpus ID: 236469262

Non-Hermitian band topology from momentum-dependent relaxation in two-dimensional metals with spiral magnetism

  title={Non-Hermitian band topology from momentum-dependent relaxation in two-dimensional metals with spiral magnetism},
  author={Johannes Mitscherling and Walter Metzner},
We study the emergence of non-Hermitian band topology in a two-dimensional metal with planar spiral magnetism due to a momentum-dependent relaxation rate. A sufficiently strong momentum dependence of the relaxation rate leads to exceptional points in the Brillouin zone, where the Hamiltonian is non-diagonalizable. The exceptional points appear in pairs with opposite topological charges and are connected by arc-shaped branch cuts. We show that exceptional points inside hole and electron pockets… Expand

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