Boundary effects on one-particle spectra of Luttinger liquids.

Schönhammer K., Meden V., Metzner W., Schollwöck U., Gunnarsson O.

Univ Gottingen Inst Theoret Phys Bunsenstr 9 D-37073 Gottingen Germany
Rhein Westfal Th Aachen Inst Theoret Phys C D-52056 Aachen Germany
Univ Munich Sekt Phys D-80333 Munich Germany
Max Planck Inst Festkorperforsch D-70506 Stuttgart Germany

We calculate one-particle spectra for a variety of models of Luttinger liquids with open boundary conditions. For the repulsive Hubbard model, the spectral weight close to the boundary is enhanced in a large energy range around the chemical potential. A power-law suppression, previously predicted by bosonization, only occurs after a crossover at energies very close to the chemical potential. Our comparison with exact spectra shows that the effects of boundaries can partly be understood within the Hartree-Fock approximation.

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Physical Review B, 61 4393-4396, 2000.

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