Disentangling Orbital and Valley Hall Effects in Bilayers of Transition Metal Dichalcogenides

Cysne, Tarik P.; Costa, Marcio; Canonico, Luis M.; Nardelli, Marco Buongiorno; Muniz, R. B.; Rappoport, Tatiana G.

doi:10.1103/physrevlett.126.056601

Cited by 99 publications

(76 citation statements)

References 65 publications

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“…The OHE has distinctive features compared to the SHE; first, the OHE originates from momentum-space orbital textures, so it universally occurs in multi-orbital systems regardless of the magnitude of SOC 12 . For example, it has been reported non-trivial orbital current can be generated in 3d transition metals, graphene, or two-dimensional transition metal dichalcogenides [13][14][15][16][17][18] . Second, theoretical calculations show that orbital Hall conductivity is much larger than spin Hall conductivity in many materials, including those commonly used for SOT such as Ta and W 10,11,13 .…”

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confidence: 99%

Efficient conversion of orbital Hall current to spin current for spin-orbit torque switching

et al. 2021

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Spin Hall effect, an electric generation of spin current, allows for efficient control of magnetization. Recent theory revealed that orbital Hall effect creates orbital current, which can be much larger than spin-Hall-induced spin current. However, orbital current cannot directly exert a torque on a ferromagnet, requiring a conversion process from orbital current to spin current. Here, we report two effective methods of the conversion through spin-orbit coupling engineering, which allows us to unambiguously demonstrate orbital-current-induced spin torque, or orbital Hall torque. We find that orbital Hall torque is greatly enhanced by introducing either a rare-earth ferromagnet Gd or a Pt interfacial layer with strong spin-orbit coupling in Cr/ferromagnet structures, indicating that the orbital current generated in Cr is efficiently converted into spin current in the Gd or Pt layer. Our results offer a pathway to utilize the orbital current to further enhance the magnetization switching efficiency in spin-orbit-torque-based spintronic devices.

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confidence: 99%

Efficient conversion of orbital Hall current to spin current for spin-orbit torque switching

et al. 2021

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“…Furthermore, due to a combination of low crystal symmetry and spin-orbit coupling (SOC) [7], these materials can host exotic excitations and exhibit different transport properties. For example, recent studies suggest that TMDs naturally lacking inversion symmetry can be exploited to drive a variety of Hall effects such as the anomalous Hall effect (AHE) [8], valley Hall effect [9,10], spin Hall effect (SHE) [11,12], or even orbital Hall effect (OHE) [13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…While the SHE is a wellknown and by now in-depth studied phenomenon [28], the OHE is much less explored [18,[20][21][22]25]. The essence of the OHE is in the coupling between the orbital motion of electrons and an electric field, which drives a transverse flow of orbital angular momentum, as opposed to spin angular momentum in SHE [13,15,18,[29][30][31]. Such orbital Hall currents can for example generate a measurable effect via the generation of orbital type of torques on the magnetization [32,33], or give rise to strong non-local spin currents via the effect of spin-orbit coupling [34].…”

Section: Introductionmentioning

confidence: 99%

Spin and orbital transport in rare earth dichalcogenides: The case of EuS$_2$

Zeer¹,

Go²,

Carbone³

et al. 2022

Preprint

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We perform first-principles calculations to determine the electronic, magnetic and transport properties of rare-earth dichalcogenides taking a monolayer of the H-phase EuS2 as a representative. We predict that the H-phase of the EuS2 monolayer exhibits a half-metallic behavior upon doping with a very high magnetic moment. We find that the electronic structure of EuS2 is very sensitive to the value of Coulomb repulsion U , which effectively controls the degree of hybridization between Eu-f and S-p states. We further predict that the non-trivial electronic structure of EuS2 directly results in a pronounced anomalous Hall effect with non-trivial band topology. Moreover, while we find that the spin Hall effect closely follows the anomalous Hall effect in the system, the orbital complexity of the system results in a very large orbital Hall effect, whose properties depend very sensitively on the strength of correlations. Our findings thus promote rare-earth based dichalcogenides as a promising platform for topological spintronics and orbitronics.

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“…In their Letter [1], the authors claimed that in bilayer MoS 2 , the valley-Hall effect (VHE) vanishes, while the orbital-Hall effect (OHE) has a sizable orbital-Hall conductivity. Consequently, the authors concluded that OHE in bilayer MoS 2 can be distinguished from VHE, in contrast to the monolayer case that OHE are entangled with VHE.…”

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confidence: 99%

Comment on “Disentangling Orbital and Valley Hall Effects in Bilayers of Transition Metal Dichalcogenides”

2021

Phys. Rev. Lett.

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Disentangling Orbital and Valley Hall Effects in Bilayers of Transition Metal Dichalcogenides

Cited by 99 publications

References 65 publications

Efficient conversion of orbital Hall current to spin current for spin-orbit torque switching

Efficient conversion of orbital Hall current to spin current for spin-orbit torque switching

Spin and orbital transport in rare earth dichalcogenides: The case of EuS$_2$

Comment on “Disentangling Orbital and Valley Hall Effects in Bilayers of Transition Metal Dichalcogenides”

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