Optical properties of lattice/spin polarons in underdoped cuprates (Contributo in atti di convegno)

Type
Label
  • Optical properties of lattice/spin polarons in underdoped cuprates (Contributo in atti di convegno) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/1742-6596/108/1/012021 (literal)
Alternative label
  • E. Cappelluti (1); S. Ciuchi (2); S. Fratini (3) (2008)
    Optical properties of lattice/spin polarons in underdoped cuprates
    in International Symposium on Lattice Effects in Cuprate High Temperature Superconductors, Natl Inst Adv Ind Sci & Technol, Tsukuba, JAPAN, OCT 31-NOV 03, 2007
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • E. Cappelluti (1); S. Ciuchi (2); S. Fratini (3) (literal)
Pagina inizio
  • 012021 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://m.iopscience.iop.org/1742-6596/108/1/012021 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 108 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • (Journal of Physics-Conference Series). IOP Publishing. (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) SMC Research Center and ISC, INFM-CNR, v. dei Taurini 19, 00185 Rome, Italy, Dipartimento di Fisica, Università 'La Sapienza', P.le A. Moro 2, 00185 Rome, Italy (2) SMC Research Istituto Nazionale di Fisica della Materia and Dipartimento di Fisica Università dell' Aquila, via Vetoio, I-67010 Coppito-L' Aquila, Italy (3) Institut Néel - CNRS & Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9, France (literal)
Titolo
  • Optical properties of lattice/spin polarons in underdoped cuprates (literal)
Abstract
  • In this paper we investigate the optical spectra of one hole in the Holstein-t-J model. We employ a dynamical mean-field theory which becomes exact in the limit of infinite connectivity. This allow us to investigate the local (incoherent) features which are related to the internal structure of the polaron, disregarding coherent motion associated with the Drude-like peak. We show that magnetic and electron-phonon interactions sustain each other in establishing polaronic regime. Polaron formation is reflected in a peculiar mid-infrared (MIR) band which is however notably different in the case of a lattice or magnetic origin. The dependence of ?(?) on the electron-phonon coupling constant ?, on the exchange interaction J and on temperature T is investigated. We compare our results with experimental data in Nd2-xCexCuO4 showing that the doping and temperature dependences of the optical conductivity in this compounds is naturally reproduced by a spin/lattice polaronic model. (literal)
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