Magnetism and superconductivity of strongly correlated electrons on the triangular lattice

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dc.creatorWeber, Cédric
dc.creatorLaeuchli, Andreas
dc.creatorMila, Frédéric
dc.creatorGiamarchi, Thierry
dc.date2005-09-20
dc.date2005-09-23
dc.date.accessioned2026-07-07T06:25:06Z
dc.date.available2026-07-07T06:25:06Z
dc.descriptionWe investigate the phase diagram of the \tj Model on a triangular lattice using a Variational Monte-Carlo approach. We use an extended set of Gutzwiller projected fermionic trial wave-functions allowing for simultaneous magnetic and superconducting order parameters. We obtain energies at zero doping for the spin-1/2 Heisenberg model in very good agreement with the best estimates. Upon electron doping (with a hopping integral $t<0$) this phase is surprisingly stable variationally up to $n\approx 1.4$, while the $d_{x^{2}-y^{2}}+i d_{xy}$ order parameter is rather weak and disappears at $n\approx 1.1$. For hole doping however the coplanar magnetic state is almost immediately destroyed and $d_{x^{2}-y^{2}}+i d_{xy}$ superconductivity survives down to $n\approx 0.8$. For lower $n$, between 0.2 and 0.8, we find saturated ferromagnetism. Moreover, there is evidence for a narrow spin density wave phase around $n\approx 0.8$. Commensurate flux phases were also considered, but these turned out {\em not} to be competitive at finite doping.
dc.description11 pages; 11 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0509520
dc.identifierhttp://arxiv.org/abs/cond-mat/0509520
dc.identifierPhys. Rev. B 73, 014519 (2006)
dc.identifierdoi:10.1103/PhysRevB.73.014519
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/96754
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleMagnetism and superconductivity of strongly correlated electrons on the triangular lattice
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