Authors Referees APS Members |
January 2008, to be published in Physical Review B1
Theory of Fermi-surface pockets and correlation effects in underdoped YBa$_2$Cu$_3$O$_{6.5}$
The detection of quantum oscillations in the electrical resistivity of YBa$_2$Cu$_3$O$_{6.5}$ provides direct evidence for the existence of Fermi surface pockets in an underdoped cuprate. We present a theoretical study of the electronic structure of YBa$_2$Cu$_3$O$_{7-\delta}$ (YBCO) aiming at establishing the nature of these Fermi pockets, i.e. CuO$_2$ plane versus CuO chain or BaO. We argue that electron correlation effects, such as orbital-dependent band distortions and highly anisotropic self-energy corrections, must be taken into account in order to properly interpret the quantum oscillation experiments. © 2008 The American Physical Society.
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