OBSERVATION BY SPIN-RESOLVED RESONANT MAGNETOTUNNELING OF OSCILLATORYLANDE FACTOR IN 2-DIMENSIONAL ELECTRON-SYSTEMS

We have shown by magnetotunneling spectroscopy that at certain magneti c fields the Lande factor g of two-dimensional electrons is significan tly enhanced relative to its three-dimensional value. The experiments were done using GaSb-AlSb-InAs-AlSb-GaSb heterostructures, in which a two-dimensional electron gas in the InAs layer is probed by holes from the GaSb electrodes tunneling in and out of it. The field dependence of the g factor is accounted for by the exchange interaction between e lectrons of the same spin.