Particle-hole symmetry breaking in the pseudogap state of Pb0.55Bi1.5Sr1.6La0.4CuO6+d: A quantum-chemical perspective
arXiv:1008.2076 · doi:10.1103/PhysRevB.83.024508
Abstract
Two Bi2201 model systems are employed to demonstrate how, beside the Cu-O σ-band, a second band of purely O2pπcharacter can be made to cross the Fermi level owing to its sensitivity to the local crystal field. This result is employed to explain the particle-hole symmetry breaking across the pseudo-gap recently reported by Shen and co-workers, see M. Hashimoto et al., Nature Physics 6, (2010) 414. Support for a two-bands-on-a-checkerboard candidate mechanism for High-Tc superconductivity is claimed.
25 pages, 8 figures
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