MAGNETOTUNNELING SPECTROSCOPY OF ONE-DIMENSIONAL WIRES

We present results of a detailed study of equilibrium magnetotunneling between an array of independent identical one-dimensional wires and a two-dimensional electron gas. From the tunneling differential conduct ance, measured as a function of the in-plane magnetic field, we find d irectly the number of occupied one-dimensional subbands, the subband e nergies, and the wave functions as a function of the strength of confi nement in these wires. As many as 14 one-dimensional subbands were pro bed. We show that an analysis of our results based on the Bardeen tunn eling Hamiltonian formalism allows the determination of the functional form of one-dimensional confining potentials. We give two examples, o ne for a narrow wire and one for a wide wire.