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• W2091208369 abstract "We investigate the excitation spectrum of strongly correlated sodium cobaltate within a realistic many-body description beyond dynamical mean-field theory (DMFT). At lower doping around $x$=0.3, rather close to Mott-critical half-filling, the single-particle spectral function of Na$_x$CoO$_2$ displays an upper Hubbard band which is captured within DMFT. Momentum-dependent self-energy effects beyond DMFT become dominant at higher doping. Around a doping level of $xsim 0.67$, the incoherent excitations give way to finite-energy spin-polaron excitations in close agreement with optics experiments. These excitations are a direct consequence of the formation of bound states between quasiparticles and paramagnons in the proximity to in-plane ferromagnetic ordering." @default.
• W2091208369 created "2016-06-24" @default.
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• W2091208369 date "2015-04-10" @default.
• W2091208369 modified "2023-09-25" @default.
• W2091208369 title "From Hubbard bands to spin-polaron excitations in the doped Mott materialNaxCoO2" @default.
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• W2091208369 doi "https://doi.org/10.1103/physrevb.91.155114" @default.
• W2091208369 hasPublicationYear "2015" @default.
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