Dresden 2003 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 11: Postersitzung II (Metall-Isolator-Überg
änge, Phasenüberg
änge in Quantensystemen, Theorie: Systeme korrelierter Elektronen)
TT 11.47: Poster
Dienstag, 25. März 2003, 14:30–19:00, P2c, P2d
Quasi-particle bound states in inhomogeneously doped t-J bilayers — •Axel Grzesik1, Simon Trebst1,2, Hartmut Monien1, and Manfred Sigrist2 — 1Physikalisches Institut, Universität Bonn, D-53115 Bonn — 2Theoretische Physik, ETH-Hönggerberg, CH-8093 Zürich
We investigate the full spectrum of quasi-particles (holes) in t-J bilayers. Besides the two-hole continuum, the spectrum exhibits bound states of s-wave and d-wave character over a wide range of parameters. Applying an electric field perpendicular to the layers, a strong hybridization of the extended and the localized s-wave states occurs. Using strong-coupling series expansions around the strong interlayer coupling limit, our investigations focus on the determination of the symmetry of the lowest lying two-hole pairing state depending on the electric field strength and the intralayer coupling. - [1] A.Grzesik, S.Trebst, H.Monien, and M.Sigrist, Quasi-particle bound states in inhomogeneously doped t-J bilayers, in preparation. - [2] S. Trebst, H.Monien, C.J.Hamer, Z.Weihong, and R.R.P. Singh, Phys. Rev. Lett. 85, 4373, (2000). - [3] A. Grzesik, Diplom thesis, (2003)