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We have performed a comparative study of the electronic structures of thespin-Peierls systems TiOCl and TiOBr by means of photoemission spectroscopy anddensity functional calculations. While the overall electronic structure ofthese isostructural compounds is qualitatively similar, the bromide appears tobe less one-dimensional. We present a quantitative analysis of the experimentaldispersions in terms of exchange constant J and hopping integral t as well as adiscussion of the qualitative spectral features. From that we conclude thatdespite the one-dimensional physics triggering the ground state in bothcompounds a proper description of the normal state electronic structure has totake into account the anisotropic frustrated interchain interactions on theunderlying triangular lattice.Comment: 5 pages, 4 figure

One-dimensional versus two-dimensional correlation effects in the oxyhalides TiOCl and TiOBr