Integrable Boundary Conditions for the One-Dimensional Hubbard Model

Details Integrable Boundary Conditions for the One-Dimensional Hubbard Model Integrable Boundary Conditions for the One-Dimensional Hubbard Model

1997-08-01

arxiv.org/abs/cond-mat/9708011v1

J. Phys. Soc. Jpn. 66 (1997) 2288-2301

Physics

Condensed Matter

Statistical Mechanics

25 pages, LaTeX file using citesort.sty, to appear in J. Phys. Soc. Jpn. 66 No.8 (1997)

Scientific paper

10.1143/JPSJ.66.2288

We discuss the integrable boundary conditions for the one-dimensional (1D) Hubbard Model in the framework of the Quantum Inverse Scattering Method (QISM). We use the fermionic R-matrix proposed by Olmedilla et al. to treat the twisted periodic boundary condition and the open boundary condition. We determine the most general form of the integrable twisted periodic boundary condition by considering the symmetry matrix of the fermionic R-matrix. To find the integrable open boundary condition, we shall solve the graded reflection equation, and find there are two diagonal solutions, which correspond to a) the boundary chemical potential and b) the boundary magnetic field. Non-diagonal solutions are obtained using the symmetry matrix of the fermionic R-matrix and the covariance property of the graded reflection equation. They can be interpreted as the SO(4) rotations of the diagonal solutions.

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