Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 6: Niederdimensionale Systeme (incl. Peierls-Übergang, organische Leiter, ...)

TT 6.1: Vortrag

Montag, 8. März 2004, 14:15–14:30, H18

Competing phases in one-dimensional interacting spinless fermion systems — •Ralph Werner and Peter Schmitteckert — Institut f"ur Theorie der Kondensierten Materie, Universit"at Karlsruhe, 76128 Karlsruhe

It has been shown that umklapp-scattering driven instabilities in one-dimensional systems can be generalized to arbitrary multiple umklapp-scattering processes at commensurate fillings given that the system has sufficiently longer range interaction [1]. At commensurate fillings the competition of interaction of different ranges leads to various phases such as charge density waves, bond order, and Luttinger liquids which are in part related to frustration effects. The phenomena are discussed for the example of half filled chains with nearest- and next-nearest-neighbor interaction.

[1] Peter Schmitteckert and Ralph Werner, cond-mat/0311280