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TT: Tiefe Temperaturen

TT 30: Postersitzung IV: Kritische Ph
änomene, Quantenstörstellen, niederdimensionale Systeme

TT 30.19: Poster

Thursday, March 11, 2004, 14:30–19:00, Poster A

One-dimensional fermions with static dimerisation: Zero-mode bosonisation and self consistent harmonic approximation — •Carmen Mocanu, Peter Schwab, Michael Dzierzawa, and Ulrich Eckern — Universität Augsburg, Theoretische Physik II, 86135 Augsburg

We investigate one-dimensional fermions with static dimerisation, where the static dimerisation is introduced as a modulation of the hopping amplitude. As theoretical tools we use bosonisation in connection with the self consistent harmonic approximation (SCHA), which is based on a variational principle. The conventional SCHA Hamiltonian is constructed by replacing the non linear terms by quadratic forms. The Klein factors and zero-modes are ignored. Here, we develop an improved SCHA, including the Klein factors and zero-modes and compare the results with the conventional procedure.