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Temperature dependent spin susceptibility in a two-dimensional metal

Victor Galitski·A. V. Chubukov·S. Das Sarma
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Abstract

We consider a two-dimensional electron system with Coulomb interaction between particles at a finite temperature T. We show that the dynamic Kohn anomaly in the response function at 2K_F leads to a linear-in-T correction to the spin susceptibility, same as in systems with short-range interaction. We show that the singularity of the Coulomb interaction at q=0 does not invalidate the expansion in powers of r_s, but makes the expansion non-analytic. We argue that the linear temperature dependence is consistent with the general structure of Landau theory and can be viewed as originating from the non-analytic component of the Landau function near the Fermi surface.

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Victor Galitski, A. V. Chubukov, S. Das Sarma. 2005-01-07. Temperature dependent spin susceptibility in a two-dimensional metal. https://doi.org/10.1103/physrevb.71.201302

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