The particle charge of a fermion is equivalent to its topological charge, which underpins the stability of the Fermi surface, the applicability of Landau Fermi liquid theory, and the Luttinger theorem in insulators.
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Topological charge of fermions and Landau theory of Fermi liquid
The particle charge of a fermion is equivalent to its topological charge, which underpins the stability of the Fermi surface, the applicability of Landau Fermi liquid theory, and the Luttinger theorem in insulators.