Abstract
We theoretically manifest that the edge of a quantum spin Hall insulator (QSHI), attached to an insulating ferromagnet (FM), can realize a highly efficient spin-to-charge conversion. Based on a one-dimensional QSHI-FM junction, the electron dynamics on the QSHI edge is analyzed, driven by a magnetization dynamics in the FM. Under a large gap opening on the edge from the magnetic exchange coupling, we find that the spin injection into the QSHI edge gets suppressed while the charge current driven on the edge gets maximized, demanded by the band topology of the one-dimensional helical edge states.
Highlights
Interconversion between spin- and charge-related quantities in materials plays an important role in manipulating spins and magnetism, especially in the context of spintronics [1,2,3]
Under a large gap opening on the edge from the magnetic exchange coupling, we find that the spin injection into the quantum spin Hall insulator (QSHI) edge gets suppressed while the charge current driven on the edge gets maximized, demanded by the band topology of the one-dimensional helical edge states
We propose that a quantum spin Hall insulator (QSHI), namely, a two-dimensional (2D) topological insulators (TIs) characterized by the Z2 topology, can realize a high spin-to-charge conversion efficiency λsc on its edge
Summary
Interconversion between spin- and charge-related quantities in materials plays an important role in manipulating spins and magnetism, especially in the context of spintronics [1,2,3]. The spin-to-charge conversion efficiency λsc ≡ −JC(2D)/eJS(3D), defined as the ratio of the charge current JC(2D) induced along the interface to the spin current JS(3D) injected from the magnet via the interface, has been reported to reach up to a few nanometers in those systems [12]. We propose that a quantum spin Hall insulator (QSHI), namely, a two-dimensional (2D) TI characterized by the Z2 topology, can realize a high spin-to-charge conversion efficiency λsc on its edge. The spin Hall conductivity of QSHI is quantized to e2/h, which generates a quantized spin current out of an applied electric field. This effect can be regarded as an ideal
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