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  1. G

    Instability of Fermi surface

    moreover, these states do not have a well defined particle number, they are a coherent state, i.e. an eigen state of the destruction operator.
  2. G

    Instability of Fermi surface

    The large density of states (DOS) refers to the DOS of a non-interacting many-body system. At low temperatures this system will arrange in a Fermi sea, where all states in momentum space are occupied up to some Fermi momentum. Now when adding interactions, one finds that the interaction energy...
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