Regensburg 2002 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 22: Postersitzung III: Syst. korr. Elektr.: Theorie II (1-15), Metall-Isol.- und Phasenüberg
änge (16-33), SL: Massivmat., Bandl., Pinning, Vortexdyn., Transport, Korngr. (34-43), Niedrigdim. Syst., Magnetotransport (44-63)

TT 22.60: Poster

Donnerstag, 14. März 2002, 14:00–17:30, A

Screening in quasi-onedimensional Fermi systems — •Carmen Mocanu, Peter Schwab and Ulrich Eckern — Institut für Physik, Universität Augsburg, 86135 Augsburg

We consider a one-dimensional, interacting Fermi system, which is coupled to a three-dimensional environment through the Coulomb interaction. The work is motivated by the idea that in the metallic state of VO₂, the electron-correlation effects in the one-dimensional d_∥ bands are screened by the three-dimensional π^* electrons. The aim is to see how the presence of the three-dimensional system affects the one-dimensional system. We calculate the magnetic and charge susceptibility for different models (Hubbard model, Luttinger and “g-ology” model). Within the random phase approximation we find that the spin susceptibility is not changed due to the coupling to the environment, whereas the charge susceptibility shows screening.