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Density Expansion for Transport Coefficients: Long-Wavelength versus Fermi Surface Nonanalyticities

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Evers, Ferdinand ; Belitz, D. ; Park, Wansoo
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Date of publication of this fulltext: 05 Jul 2021 05:32


The expansion of the conductivity in 2- d quantum Lorentz models in terms of the scatterer density n is considered. We show that nonanalyticities in the density expansion due to scattering processes with small and large momentum transfers, respectively, have different functional forms. Some of the latter are not logarithmic, but rather of power-law nature, in sharp contrast to the 3- d case. In a ...


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