Spin-pumping into surface states of topological insulator α-Sn, spin to charge conversion at room temperature

Abstract

We present experimental results on the conversion of a spin current into a charge current by spin pumping into the Dirac cone with helical spin polarization of the elemental topological insulator (TI) α-Sn[1-3]. By angle-resolved photoelectron spectroscopy (ARPES) we first confirm that the Dirac cone at the surface of α-Sn (0 0 1) layers subsists after covering 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[4-5]. Our observation of an Inverse Edelstein Effect length[5-6] much longer than for Rashba interfaces[5-10] demonstrates the potential of the TI for 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 TI for spin to charge conversion and the conditions to reach it.

14 pages, 5 figures

References in corpus (22)

• Topological Insulators
• Topological insulators and superconductors
• Topological Insulators in Three Dimensions
• Topological Insulators with Inversion Symmetry
• Spin Caloritronics
• Direct electronic measurement of the spin Hall effect
• Spin Transfer Torque Generated by the Topological Insulator Bi_2Se_3
• Spin transfer torque devices utilizing the giant spin Hall effect of tungsten
• Large-gap quantum spin Hall insulators in tin films
• Giant Spin-splitting in the Bi/Ag(111) Surface Alloy
• Spin Pumping and Inverse Spin Hall Effect in Platinum: The Essential Role of Spin-Memory Loss at Metallic Interfaces
• Detection and quantification of inverse spin Hall effect from spin pumping in permalloy/normal metal bilayers
• Spin-orbit-torque magnetization switching of a three terminal perpendicular magnetic tunnel junction
• Inverse Edelstein Effect
• Observation of inverse spin Hall effect in bismuth selenide
• Elemental Topological Insulator with a Tunable Fermi Level: Strained α-Sn on InSb(001)
• Transport in three-dimensional topological insulators: theory and experiment
• Spin-Polarized Tunneling Study on Spin-Momentum Locking in the Topological Insulators
• Tuning a Schottky barrier in a photoexcited topological insulator with transient Dirac cone electron-hole asymmetry
• Dirac cone with helical spin polarization in ultrathin $\alpha$-Sn(001) films
• Origin of inverse Rashba-Edelstein effect at Cu/Bi interface using lateral spin valves
• Spin-Charge Locking and Tunneling into a Helical Metal

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