title: Quantum cavity for spin due to spin-orbit interaction at a metal boundary.
abstract: A quantum cavity for spin is created using a tungsten crystal as substrate of high nuclear charge and breaking the structural inversion symmetry through deposition of a gold quantum film. Spin- and angle-resolved photoelectron spectroscopy shows directly that quantum-well states and the "matrioshka" or Russian nested doll Fermi surface of the gold film are spin polarized and spin-orbit split up to a thickness of at least nine atomic layers. Ferromagnetic materials or external magnetic fields are not required, and the quantum film does not need to possess a high atomic number as analogous results with silver show.
authors.affiliation: Helmholtz-Zentrum für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Varykhalov
authors.forename: J
authors.initials: J
authors.lastname: Sánchez-Barriga
authors.forename: A M
authors.initials: AM
authors.lastname: Shikin
authors.forename: W
authors.initials: W
authors.lastname: Gudat
authors.forename: W
authors.initials: W
authors.lastname: Eberhardt
authors.forename: O
authors.initials: O
authors.lastname: Rader