Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-05-21
Europhys. Lett. 67, 1011 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 3 figures, EPL style
Scientific paper
10.1209/epl/i2004-10158-9
Recently observed splitting in angular resolved photoemission spectroscopy (ARPES) on $\chem{Bi_2Sr_{2-x}La_xCuO_{6+\delta}}$ high--temperature superconductor (Janowitz C. {\it et al.}, {\it Europhys. Lett.}, {\bf 60} (2002) 615) is interpreted within the phenomenological Luttinger--liquid framework, in which both the non--Fermi liquid scaling exponent of the spectral function and the spin--charge separation are introduced. The anomalous Green function with adjustable parameters fits very well to the Fermi edge and the low--energy part of ARPES along the $\Gamma-M$ line in the Brillouin zone. In contrast to one--dimensional models with Luttinger--liquid behavior we find that both the anomalous scaling $\alpha$ and the parameter $\delta$ describing the spin--charge separation are momentum dependent. The higher--energy part of the spectra is not accounted for by this simple Luttinger--liquid form of the Green function. In this energy regime additional scattering processes are plausible to produce the experimentally observed wide incoherent background, which diminishes as the inverse of the energy.
Byczuk Krzysztof
Janowitz Christoph
Manzke Recardo
Spalek Jozef
Wojcik Waldemar
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