title: Spin to Charge Conversion at Room Temperature by Spin Pumping into a New Type of Topological Insulator: α-Sn Films.
abstract: We present results on spin to charge current conversion in experiments of resonant spin pumping into the Dirac cone with helical spin polarization of the elemental topological insulator (TI) α-Sn. By angle-resolved photoelectron spectroscopy (ARPES), we first check that the Dirac cone (DC) at the α-Sn (0 0 1) surface subsists after covering Sn with Ag. Then we show that resonant spin pumping at room temperature from Fe through Ag into α-Sn layers induces a lateral charge current that can be ascribed to the inverse Edelstein effect by the DC states. Our observation of an inverse Edelstein effect length much longer than those generally found for Rashba interfaces demonstrates the potential of TIs for the conversion between spin and charge in spintronic devices. By comparing our results with data on the relaxation time of TI free surface states from time-resolved ARPES, we can anticipate the ultimate potential of the TI for spin to charge conversion and the conditions to reach it.
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: Université Grenoble Alpes, INAC-SP2M, F-38000 Grenoble, France.|CEA, Institut Nanosciences et Cryogénie, F-38000 Grenoble, France.
authors.forename: S
authors.initials: S
authors.lastname: Oyarzún
authors.affiliation: Université Grenoble Alpes, INAC-SP2M, F-38000 Grenoble, France.|CEA, Institut Nanosciences et Cryogénie, F-38000 Grenoble, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Fu
authors.affiliation: Université Grenoble Alpes, INAC-SP2M, F-38000 Grenoble, France.|CEA, Institut Nanosciences et Cryogénie, F-38000 Grenoble, France.
authors.forename: A
authors.initials: A
authors.lastname: Marty
authors.affiliation: Université Grenoble Alpes, INAC-SP2M, F-38000 Grenoble, France.|CEA, Institut Nanosciences et Cryogénie, F-38000 Grenoble, France.
authors.forename: C
authors.initials: C
authors.lastname: Vergnaud
authors.affiliation: Université Grenoble Alpes, INAC-SP2M, F-38000 Grenoble, France.|CEA, Institut Nanosciences et Cryogénie, F-38000 Grenoble, France.
authors.forename: S
authors.initials: S
authors.lastname: Gambarelli
authors.affiliation: Université Grenoble Alpes, INAC-SP2M, F-38000 Grenoble, France.|CEA, Institut Nanosciences et Cryogénie, F-38000 Grenoble, France.
authors.forename: L
authors.initials: L
authors.lastname: Vila
authors.affiliation: Université Grenoble Alpes, INAC-SP2M, F-38000 Grenoble, France.|CEA, Institut Nanosciences et Cryogénie, F-38000 Grenoble, France.
authors.forename: M
authors.initials: M
authors.lastname: Jamet
authors.affiliation: Graduate School of Frontier Biosciences, Osaka University, Suita 565-0871, Japan.|Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Ohtsubo
authors.affiliation: UR1 CNRS, Synchrotron SOLEIL, Saint-Aubin, 91192 Gif sur Yvette, France.|Synchrotron SOLEIL, Saint-Aubin, 91192 Gif sur Yvette, France.
authors.forename: A
authors.initials: A
authors.lastname: Taleb-Ibrahimi
authors.affiliation: Synchrotron SOLEIL, Saint-Aubin, 91192 Gif sur Yvette, France.
authors.forename: P
authors.initials: P
authors.lastname: Le Fèvre
authors.affiliation: Synchrotron SOLEIL, Saint-Aubin, 91192 Gif sur Yvette, France.
authors.forename: F
authors.initials: F
authors.lastname: Bertran
authors.affiliation: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors.forename: N
authors.initials: N
authors.lastname: Reyren
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: A
authors.initials: A
authors.lastname: Fert
mesh_terms: D007501:Iron / Q000737:chemistry; D008962:Models, Theoretical; D056951:Photoelectron Spectroscopy / Q000379:methods; D012834:Silver / Q000737:chemistry; D013696:Temperature; D014001:Tin / Q000737:chemistry*
chemical_list: D012834:Silver; D014001:Tin; D007501:Iron