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Unified description of charge and spin excitations of stripes in cuprates.pdf

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Unified description of charge and spin excitations of stripes in cuprates

a r X i v : c o n d - m a t / 0 6 0 6 4 1 1 v 1 [ c o n d - m a t .s u p r - c o n ] 1 5 J u n 2 0 0 6 Unifieddescriptionof chargeandspinexcitationsof stripes in cuprates. J. Lorenzana a and G. Seibold b aSMC-INFM,ISC-CNR and Dipartimento di Fisica, Universita? di Roma “La Sapienza”, Piazzale Aldo Moro 2, I-00185 Roma, Italy bInstitut fu?r Physik, BTU Cottbus, PBox 101344, 03013 Cottbus, Germany Abstract We study stripes in cuprates within the one-band and the three-band Hubbard model. Magnetic and charge excitations are described within the time-dependent Gutzwiller approximation. A variety of experiments (charge profile from resonant soft X-ray scattering, incommensurability vs. doping, optical excitations, magnetic excitations, etc.) are described within the same approach. Key words: Firstkeyword, Secondkeyword, Thirdkeyword PACS: 74.72.-h, 74.25.Gz., 71.45.Lr, 72.10.Di 1. Introduction If the mechanism of high-Tc superconductivity is electronic, to understand the excitation spectrum is as important as to understand phonons was impor- tant to develop BCS theory. In this regard charge and spin inhomogeneous states, often found in strongly correlated systems, are interesting because they can support new collective modes, “electronic phonons”, that would not be present in a weakly interacting fluid. For example stripes in cuprates have many oscillatory modes that can couple with carriers and eventually lead to pairing and super- conductivity or anomalous Fermi liquid properties. Cuprates, unlike BCS superconductors, are unique and therefore their remarkable proper- ties may well be rooted on details. For example a recent study shows that superconductivity in La2?xSrxCuO4 appears only when incommensurate low energy scattering parallel to the CuO bond is present and not, when the scattering is on the diagonals (at very low doping), or when the sys- tem is in a more conventional Fermi liquid phase at high doping[1], thus the excitation spectra must be understood