The detection of quantum oscillations in the electrical resistivity of YBa2Cu3O6.5 provides direct evidence for the existence of Fermi surface pockets in an underdoped cuprate. We present a theoretical study of the electronic structure of YBa2Cu3O7-d (YBCO) aiming at establishing the nature of these Fermi pockets, i.e. CuO2 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.
@article{arxiv.0706.4276,
title = {Fermi pockets and correlation effects in underdoped YBa2Cu3O6.5},
author = {I. S. Elfimov and G. A. Sawatzky and A. Damascelli},
journal= {arXiv preprint arXiv:0706.4276},
year = {2009}
}
Comments: A high-resolution version can be found at http://www.physics.ubc.ca/~quantmat/ARPES/PUBLICATIONS/Articles/YBCO_OrthoII_LDA.pdf