SEMICLASSICAL DESCRIPTION OF RESONANT-TUNNELING

We derive a semiclassical formula for the tunneling current of electro ns trapped in a potential well which can tunnel into and across a wide quantum well. The calculations idealize an experimental situation whe re a strong magnetic field tilted with respect to an electric field is used. The resulting semiclassical expression is written as the sum ov er special periodic orbits which hit both walls of the quantum well an d are perpendicular to the first wall. Different types of approximatio ns are discussed.