Effect of paramagnetic fluctuations on a Fermi-surface topological transition in two dimensions

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Abstract
We study the Fermi-surface topological transition of the pocket-opening type in a two-dimensional Fermi liquid. We find that the paramagnetic fluctuations in an interacting Fermi liquid typically drive the transition first order at zero temperature. We first gain insight from a calculation using second-order perturbation theory in the self-energy. This is valid for weak interaction and far from instabilities. We then extend the results to stronger interaction, using the self-consistent fluctuation approximation. Experimental signatures are given in light of our results.
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  • Engineering and Physical Sciences Research Council (EP/H049797/1, EP/l02669X/1)

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