Dieter Jaksch awarded with the 2018 Thomas Young Medal and Prize

for "his contributions to theoretical proposals enabling the study of non-equilibrium quantum many-body dynamics with unprecedented microscopic control in ultra-cold atoms, and establishing them as a quantum technologies platform".

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Jean-Marc Triscone awarded a honorary doctorate

by the Norwegian University of Science and Technology (NTNU)

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Publication Detail / Abstract

W. Wu, A. Georges, M. Ferrero

Pseudogap and Fermi surface topology in the two-dimensional Hubbard model

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One of the distinctive features of hole-doped cuprate superconductors is the onset of a `pseudogap' below a temperature T. Recent experiments suggest that there may be a connection between the existence of the pseudogap and the topology of the Fermi surface. Here, we address this issue by studying the two-dimensional Hubbard model. We show that electronic correlations can strongly modify the Fermi surface as compared to its non-interacting shape. We find that the pseudogap only exists when the Fermi surface is hole-like and that, for a broad range of parameters, its opening is concomitant with a Fermi surface topology change from electron- to hole-like. The pseudogap is shown to be associated with a pole-like feature in the electronic self-energy, which also controls the location of the Fermi surface topology transition through particle-hole asymmetry, hence providing a common link between these observations. We discuss the relevance of our results to experiments on cuprates.
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