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Theory of many-fermion systems. II. The case of Coulomb interactions

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Belitz, D. ; Evers, Ferdinand ; Kirkpatrick, T. R.
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Date of publication of this fulltext: 05 Jul 2021 05:42


In a recent paper a general field-theoretical description of many-fermion systems with short-range interactions has been developed. Here we extend this theory to the case of disordered electrons interacting via a Coulomb potential. A detailed discussion is given of the Ward identity that controls the soft modes in the system, and the generalized nonlinear σ model for the Coulombic case is derived and discussed.

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