Dynamical mean field theory of an effective three-band model for Na${}_x$CoO${}_2$

Abstract

We derive an effective Hamiltonian for highly correlated $t_{2g}$ states centered at the Co sites of Na${}_x$CoO${}_2$. The essential ingredients of the model are an O mediated hopping, a trigonal crystal-field splitting, and on-site effective interactions derived from the exact solution of a multi-orbital model in a CoO${}_6$ cluster, with parameters determined previously. The effective model is solved by dynamical mean-field theory (DMFT). We obtain a Fermi surface (FS) and electronic dispersion that agrees well with angle-resolved photoemission spectra (ARPES). Our results also elucidate the origin of the "sinking-pockets" in different doping regimes.

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Cited by in corpus (14)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• Functional Renormalization Group for multi-orbital Fermi Surface Instabilities
• The Paired Electron Crystal: order from frustration in the quarter-filled band
• Anisotropic chiral d+id superconductivity in NaxCoO2 yH2O
• Na ordering imprints a metallic kagome lattice onto the Co planes of Na2/3CoO2
• Defect states and excitations in a Mott insulator with orbital degrees of freedom: Mott-Hubbard gap versus optical and transport gaps in doped systems
• Defect states and spin-orbital physics in doped vanadates Y1-xCaxVO3
• Experimental study of the incoherent spectral weight in the photoemission spectra of the misfit cobaltate [Bi2Ba2O4][CoO2]2
• Effective Hamiltonian for transition-metal compounds. Application to Na_xCoO_2
• Considerable non-local electronic correlations in strongly doped Na${}_x$CoO${}_2$
• Effect of covalency and interactions on the trigonal splitting in NaxCoO2
• Theory of carrier concentration-dependent electronic behavior in layered cobaltates
• Accessing topological superconductivity via a combined STM and renormalization group analysis
• A possibility of high spin hole states in doped CoO${}_2$ layered systems