Interacting electrons in one dimension form a non-Fermi liquid state called a Luttinger liquid, whereby low-energy excited states are collective modes and the single-particle density of states vanishes at the Fermi level. Experimental evidence for a breakdown of the Fermi liquid picture will be presented in the case of a new type of quantum wire fabricated by cleaved-edge overgrowth in aluminum arsenide (AlAs).

Walter Schottky Institute, Technical University of Munich, Germany