arXiv:1108.4284 · Europhysics Letters (EPL)

Variational study of Fermi surface deformations in Hubbard models

Jörg Bünemann, Tobias Schickling, Florian Gebhard

Published Apr 1, 2012• 60 citations

Abstract

We study the correlation-induced deformation of Fermi surfaces by means of a new diagrammatic method which allows for the analytical evaluation of Gutzwiller wave functions in finite dimensions. In agreement with renormalization group results we find Pomeranchuk instabilities in two-dimensional Hubbard models for sufficiently large Coulomb interactions.

DOI: 10.1209/0295-5075/98/27006

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arXiv:1108.4284 · Europhysics Letters (EPL)

Variational study of Fermi surface deformations in Hubbard models

Jörg Bünemann, Tobias Schickling, Florian Gebhard

Published Apr 1, 2012• 60 citations

arXiv HTML PDF

Abstract

DOI: 10.1209/0295-5075/98/27006

Related papers

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U(V).

The interaction V effectively renormalizes the ${t}^{\ensuremath{'}}$ parameter to smaller values, which favors nesting. It also induces changes in the topology of the Fermi surface, which can go from holelike to electronlike. This may explain the results of recent angle-resolved photoemission spectroscopy experiments.

{n}_{\mathrm{k}}

and ground-state energy E for arbitrary density n and interaction strength U. In the case of a half-filled band and large U, hitherto unexpected nonanalyticities are found. The results allow for the first approximation-free assessment of the properties of the Gutzwiller wave function. It is shown that the well-known Gutzwiller approximation may be derived diagrammatically, too. The approximation is seen to yield the exact results for expectation values in terms of this wave function in the limit of infinite dimensionality.