Abstract
We investigate the long-standing question whether or not a large spin-orbit splitting can be induced in a light quantum film by a substrate effect. It is shown that quantum-well states in Al films on W(110) display large Rashba-type spin-orbit splittings up to at least ten monatomic layers (MLs) in angle-resolved photoemission measurements with and without spin resolution. Moreover, at 10 ML thickness, a non-Rashba-type behavior of the splitting is observed attaining its maximum value $({\ensuremath{\Delta}}_{\text{so}}\ensuremath{\sim}0.3\text{ }\text{eV})$ for electron wave vectors around the border of the projected substrate band gap. This deviation from the Rashba model is explained as direct interaction of quantum-well states with spin-orbit split states of the substrate.
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