Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102486
Title: Fermi condensation near van Hove singularities within the Hubbard model on the triangular lattice
Authors: Yudin, D.
Hirschmeier, D.
Hafermann, H.
Eriksson, O.
Lichtenstein, A. I.
Katsnelson, M. I.
Issue Date: 2014
Citation: Fermi condensation near van Hove singularities within the Hubbard model on the triangular lattice / D. Yudin, D. Hirschmeier, H. Hafermann, et al. — DOI 10.1103/PhysRevLett.112.070403 // Physical Review Letters. — 2014. — Vol. 112. — Iss. 7. — 070403.
Abstract: The proximity of the Fermi surface to van Hove singularities drastically enhances interaction effects and leads to essentially new physics. In this work we address the formation of flat bands ("Fermi condensation") within the Hubbard model on the triangular lattice and provide a detailed analysis from an analytical and numerical perspective. To describe the effect we consider both weak-coupling and strong-coupling approaches, namely the renormalization group and dual fermion methods. It is shown that the band flattening is driven by correlations and is well pronounced even at sufficiently high temperatures, of the order of 0.1-0.2 of the hopping parameter. The effect can therefore be probed in experiments with ultracold fermions in optical lattices. © 2014 American Physical Society.
URI: http://hdl.handle.net/10995/102486
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84894698794
PURE ID: 335177
45251059-d53b-4edf-b2cd-dcb6f4b2907b
ISSN: 319007
DOI: 10.1103/PhysRevLett.112.070403
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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