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By in-situ change of polarization a small splitting of the Zhang-Rice singletstate band near the Fermi level has been resolved for optimum doped (x=0.4)Bi$_{2}$Sr$_{2-x}$La$_{x}$CuO$_{6+\delta}$ at the (pi,0)-point (R.Manzke et al.PRB 63, R100504 (2001). Here we treat the momentum dependence and lineshape ofthe split band by photoemission in the EDC-mode with very high angular andenergy resolution. The splitting into two destinct emissions could also beobserved over a large portion of the major symmetry line $\Gamma$M, giving thedispersion for the individual contributions. Since bi-layer effects can not bepresent in this single-layer material the results have to be discussed in thecontext of one-particle removal spectral functions derived from currenttheoretical models. The most prominent are microscopic phase separationincluding striped phase formation, coexisting antiferromagnetic andincommensurate charge-density-wave critical fluctuations coupled to electrons(hot spots) or even spin charge separation within the Luttinger liquid picture,all leading to non-Fermi liquid like behavior in the normal state and havingsevere consequences on the way the superconducting state forms. Especially thepossibilty of observing spinon and holon excitations is discussed.Comment: 5 pages, 4 figure

europhysics letters

Unusual electronic ground state of a prototype cuprate: Band splitting of single CuO 2 -plane Bi 2 Sr 2 − x La x CuO 6 + δ