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New results of angle resolved photoemission on cuprates are discussed from point of view of the self-consistent self-energy description. We show that while a number of the reported features in the ARPES spectra, either intrinsic or not, could be roughly explained by the self-energy effect, the self-consistency requirement [1] imposes strong constrains on both the relevance (or integrity) of photoemission data and conformity of the models behind it. In the light of this, we address two problems: the possibility of self-consistent description of the quasiparticle spectrum over the whole Brillouin zone [2, 3] and the understanding of every fine detail of the spectrum along the nodal direction [4-8]. We conclude that within the present experimental accuracy the whole spectrum of the one-particle excitations in the cuprates can be completely described by the quasiparticle self-energy with the inelastic and elastic constituents. The former is predominantly formed by the electron-electron scattering of two types: over the charge channel, which is essentially doping independent, and over the spin channel, which reveals the critical dependence on doping and temperature. The latter is dominated by the forward scattering on out-of-plane impurities. The similarity of the quasiparticle spectra in cuprates and other two-dimensional materials are also discussed.
[1] A. A. Kordyuk et al., Phys. Rev. B 71, 214513 (2005). [2] D. S. Inosov et al., cond-mat/0612040. [3] V. B. Zabolotnyy et al., cond-mat/0608295. [4] A. A. Kordyuk et al., Phys. Rev. Lett. 97, 017002 (2006). [5] S. V. Borisenko et al., Phys. Rev. Lett. 96, 067001 (2006). [6] S. V. Borisenko et al., Phys. Rev. Lett. 96, 117004 (2006). [7] V. B. Zabolotnyy et al., Phys. Rev. Lett. 96, 037003 (2006). [8] D. V. Evtushinsky et al., Phys. Rev. B 74, 172509 (2006). |
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