Staggered spin Hall conductivity

Xue, Fei; Haney, Paul M.

doi:10.1103/physrevb.102.195146

Cited by 5 publications

(5 citation statements)

References 41 publications

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“…The spin density in the CSI region has components in all three directions (figure 3). According to the Td-WTe 2 crystal symmetries, for a current in a (x) only the spin-polarization component along b (ŷ) is allowed: the ISGE can generate a spin density in ŷ, while the spin Hall current flowing in ẑ should also be polarized along ŷ [60]. Therefore, the x and ẑ components are not expected in the bulk of Td-WTe 2 , which indicates that both originate from interfacial or proximity-induced effects in graphene considering the reduced symmetry of the heterostructure [60].…”

Section: Origin Of the Observed Csi In Graphene-wtementioning

confidence: 99%

Resolving spin currents and spin densities generated by charge-spin interconversion in systems with reduced crystal symmetry

et al. 2022

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The ability to control the generation of spins in arbitrary directions is a long-sought goal in spintronics. Charge to spin interconversion (CSI) phenomena depend strongly on symmetry. Systems with reduced crystal symmetry allow anisotropic CSI with unconventional components, where charge and spin currents and the spin polarization are not mutually perpendicular to each other. Here, we demonstrate experimentally that the CSI in graphene-WTe2 induces spins with components in all three spatial directions. By performing multi-terminal nonlocal spin precession experiments, with specific magnetic fields orientations, we discuss how to disentangle the CSI from the spin Hall and inverse spin galvanic effects.

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Section: Origin Of the Observed Csi In Graphene-wtementioning

confidence: 99%

Resolving spin currents and spin densities generated by charge-spin interconversion in systems with reduced crystal symmetry

et al. 2022

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“…3 show that σ x xy and σ y xy have the angular dependence σ x xy ∼ sin 2θ cos φ ∼ B x B z and σ y xy ∼ sin 2θ sin φ ∼ B y B z , which agree with the previous symmetry analysis given in Eq. (18). Furthermore, Figs.…”

Section: Magnetic Field In Arbitrary Directionsmentioning

confidence: 86%

“…This indicates that the magnetic-field dependence of the SHC is given by Eq. (18). The other spin Hall tensor elements vanish due to the topological constraints in the TDSMs.…”

Section: Symmetry-constrained Shcmentioning

confidence: 98%

“…Recently, it has been shown, both theoretically and experimentally, that anisotropic spin-charge conversion with unconventional SHC components occurs in layered Weyl semimetals-such as WTe 2 and MoTe 2 -due to reduced crystal symmetry [17][18][19][20] . On the other hand, magnetic materials with spin-orbit coupling allow for even more spin Hall current configurations due to the breaking of additional mirror and rotational symmetries by the magnetization 21,22 .…”

Section: Introductionmentioning

confidence: 99%

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Tunable spin-charge conversion in class-I topological Dirac semimetals

Li,

Shen,

Zhang

2021

Preprint

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We theoretically demonstrate that type-I topological Dirac semimetals (TDSMs) can provide a platform for realizing both electrically and magnetically tunable spin-charge conversion. With time-reversal symmetry, the spin component along the uniaxial rotation axis (z-axis) is approximately conserved, which leads to an anisotropic spin Hall effect-the resulting spin Hall current relies on the relative orientation between the external electric field and the z-axis. The application of a magnetic field, on the other hand, breaks timereversal symmetry, driving the TDSM into a Weyl semimetal phase and, consequently, partially converting the spin current to a charge Hall current. Using the Kubo formulas, we numerically evaluate the spin and charge Hall conductivities based on a low-energy TDSM Hamiltonian together with the Zeeman coupling. Besides the conventional tensor element of the spin Hall conductivity σ z xy , we find that unconventional components, such as σ x xy and σ y xy , also exist and vary as the magnetic field is rotated. Likewise, the charge Hall conductivity also exhibits appreciable tunability upon variation of the magnetic field.We show that such tunability originates from the interplay of symmetry and band topology of the TDSMs.

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“…The work-horse techniques for this purpose have been electrical measurements of current-induced magnetic reorientation with readout based on the magnetoresistance properties of the samples (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19), but these have some shortcomings. One must be careful to separate thermoelectric voltages from the torque signals (20,21), and, even when performed carefully, different electrical techniques can often produce quantitatively inconsistent measurements, indicating that some may be affected by artifacts that are not yet understood (22)(23)(24)(25)(26). Furthermore, in cases when one wishes to measure SOTs acting on insulating magnetic layers, electrical measurements provide much lower signal levels compared to metallic magnets due to decreased magnetoresistance.…”

Section: Introductionmentioning

confidence: 99%

Sagnac interferometry for high-sensitivity optical measurements of spin-orbit torque

Karimeddiny,

Cham,

Smedley

et al. 2023

Sci. Adv.

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Sagnac interferometry can provide a substantial improvement in signal-to-noise ratio compared to conventional magnetic imaging based on the magneto-optical Kerr effect. We show that this improvement is sufficient to allow quantitative measurements of current-induced magnetic deflections due to spin-orbit torque even in thin-film magnetic samples with perpendicular magnetic anisotropy, for which the Kerr rotation is second order in the magnetic deflection. Sagnac interferometry can also be applied beneficially for samples with in-plane anisotropy, for which the Kerr rotation is first order in the deflection angle. Optical measurements based on Sagnac interferometry can therefore provide a cross-check on electrical techniques for measuring spin-orbit torque. Different electrical techniques commonly give quantitatively inconsistent results so that Sagnac interferometry can help to identify which techniques are affected by unidentified artifacts.

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Staggered spin Hall conductivity

Cited by 5 publications

References 41 publications

Resolving spin currents and spin densities generated by charge-spin interconversion in systems with reduced crystal symmetry

Resolving spin currents and spin densities generated by charge-spin interconversion in systems with reduced crystal symmetry

Tunable spin-charge conversion in class-I topological Dirac semimetals

Sagnac interferometry for high-sensitivity optical measurements of spin-orbit torque

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