ANGLE-RESOLVED PHOTOEMISSION OF QUASI-ONE-DIMENSIONAL METALS - EVIDENCE FOR LUTTINGER LIQUID BEHAVIOR

We present angular resolved photoemission data of the quasi-one-dimens ional metals K0.3MoO3 and (TaSe4)(2)I. The measured conduction band di spersions reflect the highly anisotropic nature of these materials. Ho wever, no clear Fermi-Dirac cutoff is observed in the spectra above th e Peierls transition, being due to either charge density wave (CDW) fl uctuations or due to electronic correlation effects in one dimension. The experimental conduction band width of (TaSe4)(2)I agrees well with a tight-binding calculation, suggesting a description as a convention al Peierls system with CDW fluctuations suppressing the spectral weigh t at the Fermi energy. In contrast, the spectra of K0.3MoO3 Show an ex citation which along the direction of highest conductivity (''easy axi s'') disperses 5 times faster than expected from band theory. This ano malous increase cannot be explained by electron-electron or electron-p honon interactions in a. Fermi liquid scenario, but can be accounted f or as holon dispersion in a Luttinger liquid framework, which need not conflict with the material's CDW properties.