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Impurities in the Heisenberg magnet and the general recipe of Weyl. (English) Zbl 1060.82501

Summary: The general recipe of Weyl is applied to the Heisenberg model of a one-dimensional magnetic chain with impurities. It is found that impurities break the obvious translational symmetry, but preserve the hidden one. Rarefied bands emerge from irregular orbits of action of the translation group.

MSC:

82B20 Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs arising in equilibrium statistical mechanics
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