The orbital Hall effect (OHE) designates the generation of a charge-neutral flow angular momentum transverse to an initial charge current. Recent theoretical investigations suggest that transition metals display sizable OHE, encouraging experimental search along this direction. Nonetheless, most these theories assume moment originates from region immediately surrounding atom core, adopting so-called {\it atomic center approximation}. In periodic crystals though, contribution interstitial...

The generation of large spin currents, and the associated torques, which are at heart modern spintronics, has long been achieved by charge-to-spin conversion mechanisms, i.e., Hall effect and/or Rashba–Edelstein effect, intrinsically linked to strong spin–orbit coupling. Recently, a novel path predicted observed for achieving significant current-induced torques originating from light elements, hence possessing weak interaction. These findings point out potential involvement orbital...

We propose a general theory of charge, spin, and orbital diffusion based on Keldysh formalism. Our findings indicate that the diffusivity angular momentum in metals is much lower than spin or charge due to strong intermixing crystals. Furthermore, our introduces concept "spin-orbit polarization" by which pure (spin) current induces longitudinal (orbital) current, process as efficient polarization ferromagnets. Finally, we find currents undergo swapping, even absence spin-orbit coupling. This...

Orbitronics has recently emerged as a very active research topic after several proposals aiming to exploit the orbital degree of freedom for charge-free electronics. In this communication, we investigate transport in selected two-dimensional systems better understand which parameters govern intra-atomic and interatomic contributions Hall effect. We study impact gap, role materials' topology influence disorder on spin transport. Starting from Kane-Mele model, describe how moment behaves...

The ever-increasing demand for efficient data storage and processing has fueled the search novel memory devices. By exploiting spin-to-charge conversion phenomena, spintronics promises faster low power solutions alternative to conventional electronics. In this work, a remarkable 34-fold increase in current is demonstrated when incorporating 2D epitaxial graphene monolayer between iron platinum layers by exploring spin-pumping on-chip Furthermore, it found that spin also anisotropic. This...

Spintronic terahertz emitters, based on optically triggered spin-to-charge conversion processes, have recently emerged as a novel route toward compact and efficient THz sources. The next challenge for technologically relevant devices, however, remains to modulate the emission with low-energy consumption during operation. In order achieve this, ferroelectric materials coupled active spin–orbit layers such two-dimensional transition metal dichalcogenides are potential candidates. this work, we...

Abstract Proximity effects between layered materials trigger a plethora of novel and exotic quantum transport phenomena. Besides, the capability to modulate nature strength proximity by changing crystalline interfacial symmetries offers vast playground optimize physical properties relevance for innovative applications. In this work, we use large-scale first principles calculations demonstrate that strain twist-angle strongly vary spin–orbit coupling (SOC) in graphene/transition metal...

Spin-orbit torques in noncentrosymmetric polycrystalline magnetic heterostructures are usually described terms of field-like and damping-like torques. However, materials with a lower symmetry point group can exhibit whose behavior substantially deviates from the conventional ones. In particular, based on arguments it was recently proposed that systems belonging to ${\text{C}}_{3\mathrm{v}}$ display spin-orbit promote field-free switching [Liu et al., Nat. Nanotechnol. 16, 277 (2021)]....

The robustness of topological materials against disorder and defects is presumed but has not been demonstrated explicitly in realistic systems. In this work, we use state-of-the-art density functional theory recursive nonequilibrium Green's functions methods to study the effect on electronic transport long nanoribbons, up $157\phantom{\rule{0.28em}{0ex}}\mathrm{nm}$, as a function vacancy concentration. narrow finite-size gives rise hybridization between edge states erasing protection....

The Hall effect has played a vital role in unraveling the intricate properties of electron transport solid materials. Here, we report on crystal symmetry-dependent in-plane (CIHE) observed CuPt/CoPt ferromagnetic heterostructure. Unlike planar (PHE), CIHE strongly depends current flowing direction (ϕI) with respect to structure. It reaches its maximum when is applied along low crystal-symmetry axes and vanishes high axes, exhibiting an unconventional angular dependence cos(3ϕI). Utilizing...

Spin and charge pumping induced by a precessing magnetization has been instrumental to the development of spintronics. Nonetheless, most theoretical studies so far treat spin-orbit coupling as perturbation, which disregards competition between exchange fields. In this work, based on Keldysh formalism Wigner expansion, we develop an adiabatic theory spin adapted systems with arbitrary coupling. We apply magnetic Rashba gas graphene cases discuss pumped ac dc current. show that current...

Two-dimensional ${\mathrm{Na}}_{3}\mathrm{Bi}$ is a dual topological insulator protected by time-reversal and mirror symmetry, resulting in promising platform for device design. However, reality, the design of devices hindered sensitivity against disorder temperature. We study properties presence intrinsic defects, investigating robustness edge states transport properties. apply recursive Green's function technique enabling disordered systems with lengths comparable to experimentally...

We investigate the influence of surface states on nonlinear Hall response driven by Berry curvature dipole in non-centrosymmetric time-reversal invariant Weyl semimetals. To do so, we perform a tomography slab system using minimal two-band model. find that type-I phase, is not particularly sensitive to presence Fermi arcs or other trivial states. However, type-II these states, be they topologically not, contribute substantially dipole, leading strong thickness dependence response. This...

Transition metal dichalcogenides (TMDCs) are promising materials for applications in nanoelectronics and correlated fields, where their metallic edge states play a fundamental role the electronic transport.

Topological insulators are quantum materials involving time-reversal protected surface states making them appealing candidates for the design of next generation highly efficient spintronic devices. The very recent observation large transient spin-charge conversion and subsequent powerful THz emission from <a:math...

We study narrow zigzag graphene nanoribbons (ZGNRs), employing density functional theory (DFT) simulations and the tight-binding (TB) method. The main result of these calculations is braiding conduction valence bands, generating Dirac cones for non-commensurate wave vectors $\vec{k}$. Employing a TB Hamiltonian, we show that generated by third-neighbor hopping (N3). calculate band structure, states conductance, new conductance channels are opened, at Fermi energy assumes integer multiples...

The ever-increasing demand for efficient data storage and processing has fueled the search novel memory devices. Spintronics offers an alternative fast solution using spin-to-charge interconversion. In this work, we demonstrate a remarkable thirty-four-fold increase in current conversion when incorporating 2D epitaxial graphene monolayer between iron platinum layers by exploring spin-pumping on-chip Furthermore, find that spin is also anisotropic. We attribute enhancement anisotropy to...

Topological insulators are quantum materials involving Time-reversal protected surface states(TSS) making them appealing candidates for the design of next generation highly efficient spintronic devices. The very recent observation large transient spin-charge conversion (SCC) and subsequent powerful THz emission from Co|Bi_{1-x}Sb_x bilayers clearly demonstrates such potentiality feasibility near future. Amongst exotic properties appearing in at materials, spin-momentum locking (SML)...

In this study, we investigate the spin and orbital densities induced by magnetization dynamics in a planar bilayer heterostructure. To do this, employed theory of adiabatic pumping using Keldysh formalism Wigner expansion. We first conduct simulations on model system to determine parameters that control into an adjacent non-magnetic metal. conclude that, principle, can be as significant when spin-orbit coupling is present ferromagnet. extend study realistic heterostructures involving heavy...

We predict the giant ferroelectric control of interfacial properties Ni/HfO2, namely, (i) magnetocrystalline anisotropy and (ii) inverse spin orbital Rashba effects. The reversible magnetic using electric gating is a promising route to low-energy consumption devices, including memories logic gates. Synthetic multiferroics, composed in proximity magnet, stand out as platform for such devices. Using combination $ab$ $initio$ simulations transport calculations, we demonstrate that reversing...

Spintronic Terahertz emitters, based on optically triggered spin-to-charge interconversion processes, have recently emerged as novel route towards compact and efficient THz sources. Yet, the next challenge for further technologically-relevant devices remains to modulate emission, with low-energy consumption operation. To this aim, ferroelectric materials coupled active spin-orbit layers such two-dimensional transition metal dichalcogenides are suitable candidates. In work, we present...