Two-dimensional Fermi liquid with fixed chemical potential

de Haas-van Alphen measurements made on the organic metal beta "-(BEDT-TTF) (2)SF5CH2CF2SO3 reveal the existence of an ideal two-dimensional (2D) Fermi surface, but rather than having the conventional sawtooth wave form that i s normally observed in all other 2D electron gases, instead, an "inverse sa wtooth'' wave form is observed, which is to be expected when the chemical p otential is pinned at a constant value. While this proves the existence of the theoretically predicted quasi-one-dimensional band, it further implies that this band has an exceptionally large density of states.