Regensburg 2002 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 14: Systeme korrelierter Elektronen: Theorie II

TT 14.4: Vortrag

Mittwoch, 13. März 2002, 15:15–15:30, H19

The Electron-Phonon Vertex in Strongly Correlated Hubbard Models — •Zhongbing Huang, Werner Hanke, and Enrico Arrigoni — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

Strongly correlated systems such as the high-Tc superconductors display simultaneously sizable electronic and electron-phonon (el-ph) interactions. A new technique is presented, whereby the el-ph vertex can very accurately be determined from frozen phonon calculations. On the basis of a QMC evaluation, it is shown that it is, in particular, the off-diagonal half-breathing (π,0) coupling, which gives rise to a large enhancement of the vertex in the hole-doped case. Relations to stripe formation and to microscopic pairing scenarios will be discussed.