Patent ID: 7109518

Claim:
An electronic element comprising (a) a layer of a doped crystal having two opposing surfaces, the doped crystal including a two-dimensional plane that confers two-dimensional conduction properties to the crystal, wherein the doped crystal is oriented such that, in the presence of an electrical field during operation of the electronic element, the two-dimensional plane is oriented effectively perpendicularly to the electrical field, and further wherein the electrostatic capacitance of the layer of the doped crystal is negative at room temperature and (b) said two opposing surfaces of the doped crystal being disposed between two electrodes, wherein the thickness of said layer of doped crystal between said electrodes is in the vicinity of nλ p /2, where λ p =2π c (∈ M/N e Q 2 ) 1/2 wherein c is the speed of light, ∈ is the dielectric constant of the crystal, M is the valence electron mass, N e is the valence electron density, Q is the valence electron charge and n is an integer.