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Regensburg 2000 – scientific programme

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TT: Tiefe Temperaturen

TT 21: Korrelierte Elektronen II

TT 21.7: Talk

Thursday, March 30, 2000, 16:15–16:30, H18

Spectral properties of incommensurate charge-density wave systems — •G. Seibold1, F. Becca2, F. Bucci3, C. Castellani3, C. Di Castro3, and M. Grilli31Lehrstuhl Theoretische Physik, BTU Cottbus, 03013 Cottbus, Germany — 2Istituto Nazionale Di Fisica Della Materia and International School for Advanced Studies, Via Beirut 4, 34013 Trieste, Italy — 3Istituto Nazionale di Fisica della Materia e Dipartimento di Fisica, Università di Roma “La Sapienza”, Piazzale A. Moro 2, 00185 Roma, Italy

The concept of frustrated phase separation is applied to investigate its consequences for the electronic structure of the high Tc cuprates. The resulting incommensurate charge density wave (CDW) scattering is most effective in creating local gaps in k-space when the scattering vector connects states with equal energy. Starting from an open Fermi surface we find that the resulting CDW is oriented along the (1,0)- and (or) (0,1)-direction which allows for a purely one-dimensional or a two-dimensional “eggbox type” charge modulation. In both cases the van Hove singularities are substantially enhanced, and the spectral weight of Fermi surface states near the M-points, tends to be suppressed. Remarkably, a leading edge gap arises near these points, which, in the eggbox case, leaves finite arcs of the Fermi surface gapless. We discuss our results with repect to possible consequences for photoemission experiments.

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