Dynamically enhanced magnetic incommensurability: Effects of local dynamics on nonlocal spin correlations in a strongly correlated metal

Autor: Demetrio Vilardi, Ciro Taranto, Walter Metzner

Publikováno v: Physical Review B. 97

We compute the spin susceptibility of the two-dimensional Hubbard model away from half-filling, and analyze the impact of frequency-dependent vertex corrections as obtained from the dynamical mean field theory (DMFT). We find that the local dynamics

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https://doi.org/10.1103/physrevb.97.235110

High-frequency asymptotics of the vertex function: diagrammatic parametrization and algorithmic implementation

Autor: Nils Wentzell, Ciro Taranto, Gang Li, Karsten Held, G. Rohringer, Agnese Tagliavini, Alessandro Toschi, Sabine Andergassen

Vertex functions are a crucial ingredient of several forefront many-body algorithms in condensed matter physics. However, the full treatment of their frequency and momentum dependence severely restricts numerical calculations. A significant advanceme

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http://arxiv.org/abs/1610.06520

Electronics with Correlated Oxides:SrVO3/SrTiO3as a Mott Transistor

Autor: Nicolaus Parragh, Jan M. Tomczak, Ciro Taranto, Zhicheng Zhong, Markus Wallerberger, Karsten Held, Giorgio Sangiovanni, Alessandro Toschi

Publikováno v: Physical Review Letters. 114

We employ density functional theory plus dynamical mean field theory and identify the physical origin of why two layers of SrVO(3) on a SrTiO(3) substrate are insulating: the thin film geometry lifts the orbital degeneracy, which in turn triggers a f

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https://doi.org/10.1103/physrevlett.114.246401

Comparing quasiparticleGW+DMFT and LDA+DMFT for the test bed material SrVO3

Autor: Karsten Held, Georg Kresse, Giorgio Sangiovanni, Merzuk Kaltak, Alessandro Toschi, Ciro Taranto, Nicolaus Parragh

Publikováno v: Physical Review B. 88

aK otaniSchilfgaarde is employed, and the interaction values are obtained from the locally unscreened random phase approximation (RPA) using a projection onto Wannier orbitals. We compare quasiparticle GW +DMFT and local density approximation (LDA) +

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https://doi.org/10.1103/physrevb.88.165119

Signature of antiferromagnetic long-range order in the optical spectrum of strongly correlated electron systems

Autor: Alessandro Toschi, Massimo Capone, Karsten Held, Giorgio Sangiovanni, Ciro Taranto, Antoine Georges

Publikováno v: Physical review. B, Condensed matter and materials physics 85 (2012): 085124. doi:10.1103/PhysRevB.85.085124
info:cnr-pdr/source/autori:Taranto, C.; Sangiovanni, G.; Held. K.; Capone, M.; Georges, A.; Toschi, A./titolo:Signature of antiferromagnetic long-range order in the optical spectrum of strongly correlated electron systems/doi:10.1103%2FPhysRevB.85.085124/rivista:Physical review. B, Condensed matter and materials physics/anno:2012/pagina_da:085124/pagina_a:/intervallo_pagine:085124/volume:85
Physical Review B

We show how the onset of a non-Slater antiferromagnetic ordering in a correlated material can be detected by optical spectroscopy. Using dynamical mean-field theory we identify two distinctive features: The antiferromagnetic ordering is associated wi

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