Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Superconductivity: (General) Theory
TT 50.5: Vortrag
Freitag, 30. März 2012, 10:30–10:45, H 3010
Is the t−J model sufficient to describe magnetic excitations in cuprates? — •Wei Chen1 and Oleg Sushkov2 — 1Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany — 2University of New South Wales, Sydney 2052, Australia
We adopt theself-consistent Born approximation to study the renormalization of magnetic excitations in a two-dimensional antiferromagnetic state due to finite hole doping. We found that the incoherent motion of holes strongly influences high energy magnons, which causes a significant reduction of magnon bandwidth at large doping. However, by comparing with recent resonant inelastic x-ray scattering data, we conclude that the strongly correlated holes, as described by the t−J model, are not sufficient to determine the magnetic excitations in underdoped cuprates.