Interplay of charge, spin, and lattice degrees of freedom in the spectral properties of the onedimensional Hubbard-Holstein model (Articolo in rivista)

Type
Label
  • Interplay of charge, spin, and lattice degrees of freedom in the spectral properties of the onedimensional Hubbard-Holstein model (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.90.195134 (literal)
Alternative label
  • A. Nocera 1, M. Soltanieh-ha1, C.A. Perroni 2, V. Cataudella2, and A. E. Feiguin 1 (2014)
    Interplay of charge, spin, and lattice degrees of freedom in the spectral properties of the onedimensional Hubbard-Holstein model
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A. Nocera 1, M. Soltanieh-ha1, C.A. Perroni 2, V. Cataudella2, and A. E. Feiguin 1 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 90 (literal)
Rivista
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  • 9 (literal)
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  • 19 (literal)
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  • 1 Department of Physics, Northeastern University, Boston MA 02115, USA 2CNR-SPIN and Dipartimento di Fisica, Univ. Federico II, Via Cinthia, Napoli, I-80126, Italy (literal)
Titolo
  • Interplay of charge, spin, and lattice degrees of freedom in the spectral properties of the onedimensional Hubbard-Holstein model (literal)
Abstract
  • We calculate the spectral function of the one dimensional Hubbard-Holstein model using the time dependent Density Matrix Renormalization Group (tDMRG), focusing on the regime of large local Coulomb repulsion, and away from electronic half-filling. We argue that, from weak to intermediate electron-phonon coupling, phonons interact only with the electronic charge, and not with the spin degrees of freedom. For strong electron-phonon interaction, spinon and holon bands are not discernible anymore and the system is well described by a spinless polaronic liquid. In this regime, we observe multiple peaks in the spectrum with an energy separation corresponding to the energy of the lattice vibrations (i.e., phonons). We support the numerical results by introducing a well controlled analytical approach based on Ogata-Shiba's factorized wave-function, showing that the spectrum can be understood as a convolution of three contributions, originating from charge, spin, and lattice sectors. We recognize and interpret these signatures in the spectral properties and discuss the experimental implications. (literal)
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