By: Pedro Sacramento
At: Instituto de Investigação Interdisciplinar, Anfiteatro
The exact solution of the Hubbard model in 1d is used to calculate dynamical correlation functions. The results compare well with experimental results for TTF-TCNQ showing evidence for charge-spin separation. We also consider the coupling between Hubbard chains and study the crossover from a Luttinger liquid like behavior in 1d to a Fermi liquid like behavior in higher dimensions.