Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.39: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
Dimerization effect on Luttinger liquid behavior — •Satoshi Ejima1, Satoshi Nishimoto2, and Florian Gebhard1 — 1Fachbereich Physik, Philipps-Universität Marburg, D-35032 Marburg, Germany — 2Max-Planck-Institut für Physik Complexer Systeme, Nöthnitzer Str. 38, D-01187 Dresden, Germany
A number of organic conductors exhibit a variety of electronic phases and some of them show a Luttinger liquid behavior due to strong one-dimensionality. For instance, a description by a Luttinger liquid seems to be more appropriate to analize experimental results (optical conductivity, photoemission spectroscopy, the dc resistivity, etc.) in (TMTCF)2X. However, theoretical investigation with one-dimensional extended Hubbard model at quarter filling has been more puzzling.
Very slow carrier density fluctuations have been observed by recent NMR experiments. A key factor for such fluctuations can be dimerization along the TMTCF stacks. We study a dimerized Hubbard chain for various band filling with density-matrix renormalization group method. We suggest that the Luttinger liquid properties are drastically affected by the dimerization especially around quarter filling.