Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique

TT 16.41: Poster

Samstag, 5. März 2005, 11:00–16:30, Poster TU C

Bosonization of dimerized Hubbard chains — •Carmen Mocanu, Peter Schwab, Michael Dzierzawa, and Ulrich Eckern — Institut für Physik, Universität Augsburg, 86135 Augsburg

The foundations of bosonization were laid more than 50 years ago in a seminal paper by Tomonaga. During the following decades the method has been worked out and successfully applied to one-dimensional electron and spin systems. Despite its long history there are still some subtle points in the bosonization formalism which are not taken into consideration in the majority of the literature. One of these issues is the proper treatment of the so-called Klein factors which have to be introduced in order to preserve the anticommuting property of the fermionic fields during the bosonization procedure.

In our approach we handle the Klein factors in a systematic way, both in the thermodynamic limit and for finite systems, using a variational method which treats the bosonic fields and the Klein factors on equal footing. As prototypical models we consider spinless fermions [1] and dimerized Hubbard chains [2].

[1] C. Mocanu, M. Dzierzawa, P. Schwab and U. Eckern, J. Phys.: Condens. Matter 16, 6445 (2004).

[2] C. Mocanu, M. Dzierzawa, P. Schwab and U. Eckern, accepted for publication in Physica Status Solidi (b) (cond-mat/0411315).