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TT: Fachverband Tiefe Temperaturen

TT 91: Superconductivity: (General) Theory 1

TT 91.3: Vortrag

Donnerstag, 19. März 2015, 12:00–12:15, H 2053

Charge Order in Cuprate Superconductors — •Sinan Bulut¹, Arno P. Kampf¹, and Bill A. Atkinson² — ¹Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Augsburg, Germany — ²Department of Physics and Astronomy, Trent University, Peterborough Ontario, Canada

Motivated by widespread experimental evidence of charge orders in underdoped cuprate superconductors, we study a three band model of a cuprate plane. Our calculations start from a pseudogap-like normal system with a reconstructed Fermi surface, and we search for charge instabilities. From the charge susceptibilities, we identify a charge ordering instability with an ordering wavevector, q^*, that matches experimental results not only with respect to the doping dependence but more importantly regarding its magnitude and direction. Namely, q^* points along the Brillouin zone axes. Thus, our results clarify the discrepancy between many recent theoretical calculations and the experiments. We extend this calculation towards possible loop current instabilities and the charge ordering pattern in bilayer systems.