Dirac-Surface-State-Dominated Spin to Charge Current Conversion in the Topological Insulator $(B{i}_{0.22}S{b}_{0.78}{)}_{2}T{e}_3$ Films at Room Temperature

Abstract

We report the spin to charge current conversation in an intrinsic topological insulator (TI) $(B{i}_{0.22}S{b}_{0.78}{)}_{2}T{e}_3$ film at room temperature. The spin currents are generated in a thin layer of permalloy (Py) by two different processes, spin pumping (SPE) and spin Seebeck effects (SSE). In the first we use microwave-driven ferromagnetic resonance of the Py film to generate a SPE spin current that is injected into the TI $(B{i}_{0.22}S{b}_{0.78}{)}_{2}T{e}_3$ layer in direct contact with Py. In the second we use the SSE in the longitudinal configuration in Py without contamination by the Nernst effect made possible with a thin NiO layer between the Py and $(B{i}_{0.22}S{b}_{0.78}{)}_{2}T{e}_3$ layers. The spin-to-charge current conversion is attributed to the inverse Edelstein effect (IEE) made possible by the spin-momentum locking in the electron Fermi contours due to the Rashba field. The measurements by the two techniques yield very similar values for the IEE parameter, which are larger than the reported values in the previous studies on topological insulators.

18 pages and 7 figures

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Cited by in corpus (22)

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• Quantum Materials for Spin and Charge Conversion
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• Large spin-to-charge conversion at room temperature in extended epitaxial Sb2Te3 topological insulator chemically grown on Silicon
• Direct detection of induced magnetic moment and efficient spin-to-charge conversion in graphene/ferromagnetic structures
• Unveiling the polarity of the spin-to-charge current conversion in $B{i}_{2}S{e}_3$
• Exploiting the close-to-Dirac point shift of Fermi level in Sb2Te3/Bi2Te3 topological insulator heterostructure for spin-charge conversion
• Planar Hall effect induced spin rectification effect and its strong impact on spin pumping measurements
• Edelstein and inverse Edelstein effects caused by the pristine surface states of topological insulators
• Efficient spin-to-charge interconversion in Weyl semimetal TaP at room temperature
• Spin torque and persistent currents caused by percolation of topological surface states
• Theory of inverse Rashba-Edelstein effect induced by spin pumping into a two-dimensional electron gas
• Persistent currents and spin torque caused by percolated quantum spin Hall state
• Unraveling the Spin-to-Charge Current Conversion Mechanism and Charge Transfer Dynamics at Interface of Graphene/WS${}_2$ Heterostructures at Room Temperature
• Charge-spin interconversion in graphene-based systems from density functional theory
• Theory of the inverse Rashba-Edelstein effect induced by thermal spin injection
• Surface-state mediated spin-to-charge conversion in Sb films via bilateral spin current injection
• Probing the Spin-Momentum Locking in Rashba Surfaces via Spin Current
• Spin Pumping into two-dimensional systems
• Terahertz time-domain signatures of the inverse Edelstein effect in topological-insulator|ferromagnet heterostructures
• One Analytical Approach of Rashba-Edelstein Magnetoresistance in 2D Materials