Faculté des sciences

Photoemission of a Quantum Cavity with a Nonmagnetic Spin Separator

Koitzsch, Christian ; Battaglia, Corsin ; Clerc, Florian ; Despont, Laurent ; Garnier, Michael Bernard Gunnar ; Aebi, Philipp

In: Physical Review B, 2005, vol. 95, no. 126401, p. 1-4

Quantum well states are a consequence of confinement in a quantum cavity. In this study we investigate with photoemission the influence of the interface electronic structure on the quantum well state energy dispersion in ultrathin Mg(0001) films on W (110). Coupling between the sp-derived quantum well states and the substrate across the interface becomes manifest in a deviation from... Plus

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    Summary
    Quantum well states are a consequence of confinement in a quantum cavity. In this study we investigate with photoemission the influence of the interface electronic structure on the quantum well state energy dispersion in ultrathin Mg(0001) films on W (110). Coupling between the sp-derived quantum well states and the substrate across the interface becomes manifest in a deviation from free electronlike dispersion behavior. Most importantly, we observe a marked level splitting, which is interpreted as due to the Rashba effect at the interface. Such an interfacial electron beam splitting on materials with strong spin-orbit coupling is an essential ingredient for novel spintronic devices. The combination of a quantum cavity with a heavy, electron reflecting substrate reveals spin-splitting effects in ultrathin films without conventional magnetism being involved.