Münster 1999 – scientific programme

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TT: Tiefe Temperaturen

TT 21: Postersitzung III: Hochfrequenzeigenschaften (1-4), Amorphe Systeme (5-9), Borkarbide (10-18), Quantenflüssigkeiten (19-25), Dünne Filme (26-49), Vortexdynamik, Pinning (50-63), M-I-Überg
änge, quantenkritische Ph
änomene (64-89)

TT 21.64: Poster

Thursday, March 25, 1999, 14:30–18:00, Foy

Integrable impurities for a small-polaron model with general open boundary conditions — •R. A. Römer, X. Guan, U. Grimm, and M. Schreiber — Institut für Physik, Technische Universität, D-09107 Chemnitz

   With the help of the graded version of the Yang-Baxter equation and the reflection equations, we construct different kinds of integrable impurities for a small-polaron model with general open boundary conditions: (a) we shift the spectral parameter of the local Lax operator at arbitrary sites and at the two edges of the model, (b) we embed the impurity fermion vertex at each end of the chain. The Hamiltonians with different types of impurities are explicitly given. The Bethe ansatz equations, as well as the eigenvalues of the Hamiltonians, are constructed by means of the quantum inverse scattering method. In addition, we discuss the ground-state properties in the thermodynamic limit.