title: Rashba-type spin-orbit splitting of quantum well states in ultrathin Pb films.
abstract: A Rashba-type spin-orbit splitting is found for quantum well states formed in ultrathin Pb films on Si (111). The resulting momentum splitting is comparable to what is found for semiconductor heterostructures. The splitting shows no coverage dependency and the sign of the spin polarization is reversed compared to Rashba splitting in the Au(111) surface state. We explain our results by competing effects at the two boundaries of the Pb layer.
authors.affiliation: Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
authors.forename: J Hugo
authors.initials: JH
authors.lastname: Dil
authors.forename: Fabian
authors.initials: F
authors.lastname: Meier
authors.forename: Jorge
authors.initials: J
authors.lastname: Lobo-Checa
authors.forename: Luc
authors.initials: L
authors.lastname: Patthey
authors.forename: Gustav
authors.initials: G
authors.lastname: Bihlmayer
authors.forename: Jürg
authors.initials: J
authors.lastname: Osterwalder