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Possible phase separation in square and honeycomb Hubbard model: A variational cluster study
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Institute for Materials Science, Los Alamos, USA.
Number of Authors: 4
2015 (English)In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 379, no 37, 2230-2238 p.Article in journal (Refereed) Published
Abstract [en]

The VCA ground state of the 2D Hubbard model is examined for possible phase separation under hole doping manifested by spatial inhomogeneities of coexisting different electron densities at equilibrium. Phase separation is accompanied by spectral weight loss and first Brillouin zone boundary deformation. Such an instability is observed in square structures and it is absent in honeycomb lattices. To our knowledge, no previous publications have revealed relationship between a Fermi surface instability and phase separation. Our VCA calculations provide strong support for this spontaneous instability, driven by electron correlations in specific lattice geometries, proposed in our earlier publications using exact quantum cluster calculations.

Place, publisher, year, edition, pages
2015. Vol. 379, no 37, 2230-2238 p.
Keyword [en]
VCA, Quantum cluster calculation, Phase separation, Nanoscale inhomogeneities, Square and honeycomb lattices, Brillouin zone deformation
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-121486DOI: 10.1016/j.physleta.2015.06.059ISI: 000360514700015OAI: diva2:860623
Available from: 2015-10-13 Created: 2015-10-05 Last updated: 2015-10-13Bibliographically approved

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Balatsky, Alexander V.
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Nordic Institute for Theoretical Physics (Nordita)
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