title: Evidence for spin-to-charge conversion by Rashba coupling in metallic states at the Fe/Ge(111) interface.
abstract: The spin-orbit coupling relating the electron spin and momentum allows for spin generation, detection and manipulation. It thus fulfils the three basic functions of the spin field-effect transistor. However, the spin Hall effect in bulk germanium is too weak to produce spin currents, whereas large Rashba effect at Ge(111) surfaces covered with heavy metals could generate spin-polarized currents. The Rashba spin splitting can actually be as large as hundreds of meV. Here we show a giant spin-to-charge conversion in metallic states at the Fe/Ge(111) interface due to the Rashba coupling. We generate very large charge currents by direct spin pumping into the interface states from 20 K to room temperature. The presence of these metallic states at the Fe/Ge(111) interface is demonstrated by first-principles electronic structure calculations. By this, we demonstrate how to take advantage of the spin-orbit coupling for the development of the spin field-effect transistor.
authors.affiliation: Institut des Nanosciences et l'Energie Atomique et Cryogénie, INAC, Commissariat á aux Energies Alternatives-Univ. Grenoble Alpes, 17 rue des Martyrs, F-38000 Grenoble, France.|CEA, INAC, F-38000 Grenoble, France.|Departamento de Fisica, CEDENNA, Universidad de Santiago de Chile (USACH), 9170124 Santiago, Chile.
authors.forename: S
authors.initials: S
authors.lastname: Oyarzún
authors.affiliation: Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany.
authors.forename: A K
authors.initials: AK
authors.lastname: Nandy
authors.affiliation: Institut des Nanosciences et l'Energie Atomique et Cryogénie, INAC, Commissariat á aux Energies Alternatives-Univ. Grenoble Alpes, 17 rue des Martyrs, F-38000 Grenoble, France.|CEA, INAC, F-38000 Grenoble, France.
authors.forename: F
authors.initials: F
authors.lastname: Rortais
authors.affiliation: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767, Palaiseau, France.
authors.forename: J-C
authors.initials: JC
authors.lastname: Rojas-Sánchez
authors.affiliation: Institut des Nanosciences et l'Energie Atomique et Cryogénie, INAC, Commissariat á aux Energies Alternatives-Univ. Grenoble Alpes, 17 rue des Martyrs, F-38000 Grenoble, France.|CEA, INAC, F-38000 Grenoble, France.
authors.forename: M-T
authors.initials: MT
authors.lastname: Dau
authors.affiliation: Institut des Nanosciences et l'Energie Atomique et Cryogénie, INAC, Commissariat á aux Energies Alternatives-Univ. Grenoble Alpes, 17 rue des Martyrs, F-38000 Grenoble, France.|CEA, INAC, F-38000 Grenoble, France.
authors.forename: P
authors.initials: P
authors.lastname: Noël
authors.affiliation: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767, Palaiseau, France.
authors.forename: P
authors.initials: P
authors.lastname: Laczkowski
authors.affiliation: Institut des Nanosciences et l'Energie Atomique et Cryogénie, INAC, Commissariat á aux Energies Alternatives-Univ. Grenoble Alpes, 17 rue des Martyrs, F-38000 Grenoble, France.|CEA, INAC, F-38000 Grenoble, France.
authors.forename: S
authors.initials: S
authors.lastname: Pouget
authors.affiliation: Institut des Nanosciences et l'Energie Atomique et Cryogénie, INAC, Commissariat á aux Energies Alternatives-Univ. Grenoble Alpes, 17 rue des Martyrs, F-38000 Grenoble, France.|CEA, INAC, F-38000 Grenoble, France.
authors.forename: H
authors.initials: H
authors.lastname: Okuno
authors.affiliation: Institut des Nanosciences et l'Energie Atomique et Cryogénie, INAC, Commissariat á aux Energies Alternatives-Univ. Grenoble Alpes, 17 rue des Martyrs, F-38000 Grenoble, France.|CEA, INAC, F-38000 Grenoble, France.
authors.forename: L
authors.initials: L
authors.lastname: Vila
authors.affiliation: Institut des Nanosciences et l'Energie Atomique et Cryogénie, INAC, Commissariat á aux Energies Alternatives-Univ. Grenoble Alpes, 17 rue des Martyrs, F-38000 Grenoble, France.|CEA, INAC, F-38000 Grenoble, France.
authors.forename: C
authors.initials: C
authors.lastname: Vergnaud
authors.affiliation: Institut des Nanosciences et l'Energie Atomique et Cryogénie, INAC, Commissariat á aux Energies Alternatives-Univ. Grenoble Alpes, 17 rue des Martyrs, F-38000 Grenoble, France.|CEA, INAC, F-38000 Grenoble, France.
authors.forename: C
authors.initials: C
authors.lastname: Beigné
authors.affiliation: Institut des Nanosciences et l'Energie Atomique et Cryogénie, INAC, Commissariat á aux Energies Alternatives-Univ. Grenoble Alpes, 17 rue des Martyrs, F-38000 Grenoble, France.|CEA, INAC, F-38000 Grenoble, France.
authors.forename: A
authors.identifier: 0000-0001-5709-6945
authors.initials: A
authors.lastname: Marty
authors.affiliation: Institut des Nanosciences et l'Energie Atomique et Cryogénie, INAC, Commissariat á aux Energies Alternatives-Univ. Grenoble Alpes, 17 rue des Martyrs, F-38000 Grenoble, France.|CEA, INAC, F-38000 Grenoble, France.
authors.forename: J-P
authors.initials: JP
authors.lastname: Attané
authors.affiliation: Institut des Nanosciences et l'Energie Atomique et Cryogénie, INAC, Commissariat á aux Energies Alternatives-Univ. Grenoble Alpes, 17 rue des Martyrs, F-38000 Grenoble, France.|CEA, INAC, F-38000 Grenoble, France.
authors.forename: S
authors.initials: S
authors.lastname: Gambarelli
authors.affiliation: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767, Palaiseau, France.
authors.forename: J-M
authors.initials: JM
authors.lastname: George
authors.affiliation: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767, Palaiseau, France.
authors.forename: H
authors.initials: H
authors.lastname: Jaffrès
authors.affiliation: Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Blügel
authors.affiliation: Institut des Nanosciences et l'Energie Atomique et Cryogénie, INAC, Commissariat á aux Energies Alternatives-Univ. Grenoble Alpes, 17 rue des Martyrs, F-38000 Grenoble, France.|CEA, INAC, F-38000 Grenoble, France.
authors.forename: M
authors.initials: M
authors.lastname: Jamet