Intrinsic spin Hall effect in systems with striped spin-orbit coupling

Seibold, G.; Caprara, S.; Raimondi, Roberto

doi:10.1209/0295-5075/112/17004

Cited by 16 publications

(8 citation statements)

References 52 publications

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“…As claimed in Refs. 33,34 , we here conclude that due to spin-flip processes along the lateral direction | C | < | Σ |, which results in a non-zero spin Hall conductance. A possible longer spin-relaxation time along the direction normal to the layer, as already experimentally evidenced in other types of confined Rashba system 35 may enhance the characteristic spin-diffusion length and size of SHE-ISHE compared to IEE in-plane effects.…”

Section: Figure 1 a Because Of Thementioning

confidence: 53%

Electric-Field Control of Spin Current Generation and Detection in Ferromagnet-Free SrTiO₃-Based Nanodevices

et al. 2019

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Spintronics entails the generation, transport, manipulation and detection of spin following the protocol outlined in the main text. Hall measurements give the change in subband population with respect to the gate voltage. Furthermore, the tight-binding band structure of the material allows us to compute the evolution of the charge filling with respect to the chemical potential. We use the Lifshitz transition as a reference point and assume that the population ratio of the heavy to the light sub-band is the same for both the experimental and numerical values. This yields a correspondence between the chemical potential and Vg and hence between and the sheet conductance .

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Section: Figure 1 a Because Of Thementioning

confidence: 53%

Electric-Field Control of Spin Current Generation and Detection in Ferromagnet-Free SrTiO₃-Based Nanodevices

et al. 2019

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“…On the theoretical side, Scopigno et al [6] suggested that the EPS in ST-LAO/STO results from a lateral confinement tendency of the MES to avoid a thermodynamically unstable state with negative compressibility. Other non-V O scenarios invoked formation of a Jahn-Teller polaronic phase [56], Rashba spin-orbit coupling [57,58], and even superconducting pairing interaction [58].…”

Section: Eps In St-lao/sto and Discussionmentioning

confidence: 99%

Electronic phase separation at LaAlO3/SrTiO3 interfaces tunable by oxygen deficiency

Strocov

Chikina

Caputo

et al. 2019

Phys. Rev. Materials

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Electronic phase separation is crucial for the fascinating macroscopic properties of the LaAlO 3 /SrTiO 3 (LAO/STO) paradigm oxide interface, including the coexistence of superconductivity and ferromagnetism. We investigate this phenomenon using angle-resolved photoelectron spectroscopy (ARPES) in the soft-x-ray energy range, where the enhanced probing depth combined with resonant photoexcitation allow us access to fundamental electronic structure characteristics-momentum-resolved spectral function, dispersions and ordering of energy bands, Fermi surface-of buried interfaces. Our experiment uses x-ray irradiation of the LAO/STO interface to tune its oxygen deficiency, building up a dichotomic system where mobile weakly correlated Ti t 2g electrons coexist with localized strongly correlated Ti e g ones. The ARPES spectra dynamics under x-ray irradiation shows a gradual intensity increase under constant Luttinger count of the Fermi surface. This fact identifies electronic phase separation (EPS) where the mobile electrons accumulate in conducting puddles with fixed electronic structure embedded in an insulating host phase, and allows us to estimate the lateral fraction of these puddles. We discuss the physics of EPS invoking a theoretical picture of oxygen-vacancy clustering, promoted by the magnetism of the localized Ti e g electrons, and repelling of the mobile t 2g electrons from these clusters. Our results on the irradiation-tuned EPS elucidate the intrinsic one taking place at the stoichiometric LAO/STO interfaces.

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“…It is also worth to notice that the spiral state implies a breaking of translational invariance of the system along the longitudinal direction and hence a modulation at an effective level of the RSOC and hopping couplings. In this sense, it would be interesting to investigate if the presently studied system shows a spin Hall conductivity that remains robust against disorder as in a recently proposed model with modulated RSOC [50].…”

Section: Discussionmentioning

confidence: 99%

Transport properties of Rashba conducting strips coupled to magnetic moments with spiral order

Riera

2018

Phys. Rev. B

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Magnetic and transport properties of a conducting layer with Rashba spin-orbit coupling (RSOC) magnetically coupled to a layer of localized magnetic moments are studied on strips of varying width. The localized moments are free to rotate and they acquire an order that results from the competition between the magnetic exchange energy and the kinetic energy of the conduction electrons. By minimizing the total Hamiltonian within the manifold of variational spiral orders of the magnetic moments, the phase diagram in the space of the interlayer exchange J sd , and the ratio of the Rashba coupling to the hopping integral, λ/t was determined. Two main phases with longitudinal spiral order were found, one at large interlayer coupling J sd with uniform order in the transversal direction, and the other at small J sd showing a transversal staggered order. This staggered spiral order is unstable against an antiferromagnetic (AFM) for large values of λ/t. In both spiral phases, the longitudinal spiral momentum that departs from the expected linear dependence with the RSOC for large values of λ/t. Then, various transport properties, including the longitudinal Drude weight and the spin Hall conductivity, inside these two phases are computed in linear response, and their behavior is compared with the ones for the more well-studied cases of a fixed ferromagnetic (FM) and AFM localized magnetic orders.

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Intrinsic spin Hall effect in systems with striped spin-orbit coupling

Cited by 16 publications

References 52 publications

Electric-Field Control of Spin Current Generation and Detection in Ferromagnet-Free SrTiO₃-Based Nanodevices

Electric-Field Control of Spin Current Generation and Detection in Ferromagnet-Free SrTiO₃-Based Nanodevices

Electronic phase separation at LaAlO3/SrTiO3 interfaces tunable by oxygen deficiency

Transport properties of Rashba conducting strips coupled to magnetic moments with spiral order

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Intrinsic spin Hall effect in systems with striped spin-orbit coupling

Cited by 16 publications

References 52 publications

Electric-Field Control of Spin Current Generation and Detection in Ferromagnet-Free SrTiO3-Based Nanodevices

Electric-Field Control of Spin Current Generation and Detection in Ferromagnet-Free SrTiO3-Based Nanodevices

Electronic phase separation at LaAlO3/SrTiO3 interfaces tunable by oxygen deficiency

Transport properties of Rashba conducting strips coupled to magnetic moments with spiral order

Contact Info

Product

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Electric-Field Control of Spin Current Generation and Detection in Ferromagnet-Free SrTiO₃-Based Nanodevices

Electric-Field Control of Spin Current Generation and Detection in Ferromagnet-Free SrTiO₃-Based Nanodevices