Optical Manipulation of Rashba Spin–Orbit Coupling at SrTiO<sub>3</sub>-Based Oxide Interfaces

Cheng, Ling; Wei, Laiming; Liang, Haixing; Yan, Yuedong; Cheng, Guanghui; Lv, Meng; Lin, Tianquan; Kang, Ting-Ting; Yu, G.; Chu, Junhao; Zhang, Zhenyu; Zeng, Changgan

doi:10.1021/acs.nanolett.7b02128

Cited by 40 publications

(59 citation statements)

References 67 publications

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“…WAL is usually considered as an indication of strong spin–orbit coupling. [ 15,37 ] WAL persists up to ≈30 K and the magnetoconductance curves can be fitted by the Hikami–Larkin–Nagaoka (HLN) model [ 38 ]

Δ σ (B) = \frac{a e^{2}}{π h} ([], 1 n (\frac{B_{ϕ}}{B}) - ψ (\frac{1}{2} + \frac{B_{ϕ}}{B}))

…”

Section: Figurementioning

confidence: 99%

High Spin Hall Conductivity in Large‐Area Type‐II Dirac Semimetal PtTe₂

et al. 2020

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Spin-orbit torque (SOT) provides an ultrafast and energy-efficient means to switch magnetization, which is of fundamental and technical importance for spintronic devices. [1][2][3][4][5] A typical SOT device consists of heavy metal/ferromagnet (HM/FM) bilayer, where the HM (e.g., Pt, W, Ta, etc.) converts charge current into spin current mainly due to the spin Hall effect (SHE) and then exerts a torque on the adjacent FM enabling magnetization manipulation. To improve the energy efficiency of SOT-driven magnetization switching, considerable efforts have been made to enhance the charge-spin conversion efficiency of HM [6][7][8][9] and reduce the shunting current in the FM. [10,11] Engineering the bilayer structure [9,12] or replacing HM by novel materials with larger charge-spin conversion efficiency and higher conductivity [10,13,14] are possible avenues to realize higher SOT efficiency. Manipulation of magnetization by electric-current-induced spin-orbit torque (SOT) is of great importance for spintronic applications because of its merits in energy-efficient and high-speed operation. An ideal material for SOT applications should possess high charge-spin conversion efficiency and high electrical conductivity. Recently, transition metal dichalcogenides (TMDs) emerge as intriguing platforms for SOT study because of their controllability in spin-orbit coupling, conductivity, and energy band topology. Although TMDs show great potentials in SOT applications, the present study is restricted to the mechanically exfoliated samples with small sizes and relatively low conductivities.Here, a manufacturable recipe is developed to fabricate large-area thin films of PtTe 2 , a type-II Dirac semimetal, to study their capability of generating SOT. Large SOT efficiency together with high conductivity results in a giant spin Hall conductivity of PtTe 2 thin films, which is the largest value among the presently reported TMDs. It is further demonstrated that the SOT from PtTe 2 layer can switch a perpendicularly magnetized CoTb layer efficiently. This work paves the way for employing PtTe 2 -like TMDs for wafer-scale spintronic device applications.

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Δ σ (B) = \frac{a e^{2}}{π h} ([], 1 n (\frac{B_{ϕ}}{B}) - ψ (\frac{1}{2} + \frac{B_{ϕ}}{B}))

…”

Section: Figurementioning

confidence: 99%

High Spin Hall Conductivity in Large‐Area Type‐II Dirac Semimetal PtTe₂

et al. 2020

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“…Light illumination can generate electron–hole pairs, which not only can contribute to the conductivity but also affect the diffusion of oxygen vacancies and thereby significantly modify the transport properties . For example, tunable persistent photoconductivity (PPC) has been reported in STO‐based heterointerfaces and combining light illumination with a gate bias, an enhancement of the resistance gatability has been demonstrated . In this section, we review the optical tunability and the underlying physical mechanisms.…”

Section: Light/matter Interactionmentioning

confidence: 99%

“…Encouraged by the tunability of this joint effect where gate bias is combined with light illumination, Cheng et al demonstrated that the quantum states could also be tuned via a gating effect by light at the STO‐based interfaces, as shown in Figure . The transition from WL to WAL implies that the Rashba spin‐orbit coupling is tunable by the light illumination with different wavelengths (470 and 940 nm) . In contrast to the conventional electrostatic gating at low temperatures (see Section ), this optical manipulation is nonvolatile and the tunability of the spin‐orbit coupling persists after turning off the light.…”

Section: Light/matter Interactionmentioning

confidence: 99%

“…In contrast to the conventional electrostatic gating at low temperatures (see Section ), this optical manipulation is nonvolatile and the tunability of the spin‐orbit coupling persists after turning off the light. The effect of the light could, however, be removed by warming up the sample to room temperature and then cooling it down to 1.5 K . This advantage shows promising application for the optical nonvolatile devices.…”

Section: Light/matter Interactionmentioning

confidence: 99%

“…This has been repeated, giving rise to different curves with the darkest blue being the initial curve and the darkest red being the curve after around 25 times illumination. Reproduced with permission . Copyright 2017, American Chemical Society.…”

Section: Light/matter Interactionmentioning

confidence: 99%

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Stimulating Oxide Heterostructures: A Review on Controlling SrTiO₃‐Based Heterointerfaces with External Stimuli

Christensen

Trier

Niu

et al. 2019

Adv Materials Inter

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Oxides are an exciting class of electronic materials which share key properties with conventional semiconductors, but also bring new intrinsic functionalities that are not used in most current electronics: superconductivity, ferro-, pyro-, and piezoelectricity, ferromagnetism, and multiferrocity. Among the large number of oxides, strontium titanate (SrTiO 3 , STO) has been the center of attention in numerous studies for more than half a century. STO both serves as a popular template for epitaxial growth of oxide thin films as well as by itself exhibiting an attractive palettes of properties, including Numerous of the greatest inventions in modern society, such as solar cells, display panels, and transistors, rely on a simple concept: An external stimulus is applied to a material and the response is then utilized. Oxides often exhibit a colorful palette of responses to external stimuli due to the close coupling between lattice, spin, orbital, and charge degrees of freedom. In particular, oxide heterostructures where oxide thin films are deposited on SrTiO 3 have proven to be a fertile playground for material scientists, and a vast amount of interesting theoretical and experimental studies showcase the wide tunabilities of these heterostructures when subjected to external stimuli. Here, the authors review how the properties of SrTiO 3 -based heterostructures can be changed by external stimuli using electric fields, magnetic fields, light, stress, particle bombardment, liquids, gases, and temperature. The application of a single stimulus or several stimuli combined often leads to unexpected changes in properties which can open up for designing new devices as well as expanding the boundaries of our understanding within fundamental science. Hall of Fame Article is a research scientist at the Technical University of Denmark, Department of Energy Conversion and Storage. He received his B.Sc. (2009) and M.Sc. (2012) in nanoscience from the University of Copenhagen, followed by his Ph.D. (2017) and postdoc (2018) from the Technical University of Denmark. His work is currently focused on the physics of oxide materials and oxide devices for information technology and energy harvesting, including oxide electronics, memristors, internet of things, and thermoelectricity. Felix Trier is a postdoctoral researcher at CNRS/Thales, University Paris-Saclay. He obtained his B.Sc. (2009) and M.Sc. (2012) in nanoscience from the University of Copenhagen. Then he earned his Ph.D. degree (2016) from the Technical University of Denmark. His current research is focused on fabrication and characterization of metallic oxide heterointerface devices for the study of the spin-charge interconversion in 2D Rashba systems. His work concerns the LaAlO 3 /SrTiO 3 heterointerface 2D metal and its electrostatic tunability.Nini Pryds is a Professor and head of the research section "Functional Oxides" at the Department of Energy Conversion and Storage, Technical University of Denmark (DTU), where he is leading a group of researchers working in the field...

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Light‐Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO₃(110) Heterointerfaces

et al. 2023

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The 2D electron system (2DES) at the KTaO 3 surface or heterointerface with 5d orbitals hosts extraordinary physical properties, including a stronger Rashba spin-orbit coupling (RSOC), higher superconducting transition temperature, and potential of topological superconductivity. Herein, a huge enhancement of RSOC under light illumination achieved at a superconducting amorphous-Hf 0.5 Zr 0.5 O 2 /KTaO 3 (110) heterointerface is reported. The superconducting transition is observed with T c = 0.62 K and the temperature-dependent upper critical field reveals the interaction between spin-orbit scattering and superconductivity. A strong RSOC with B so = 1.9 T is revealed by weak antilocalization in the normal state, which undergoes sevenfold enhancement under light illumination. Furthermore, RSOC strength develops a dome-shaped dependence of carrier density with the maximum of B so = 12.6 T achieved near the Lifshitz transition point n c ≈ 4.1 × 10 13 cm −2 . The highly tunable giant RSOC at KTaO 3 (110)-based superconducting interfaces show great potential for spintronics.

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Optical Manipulation of Rashba Spin–Orbit Coupling at SrTiO₃-Based Oxide Interfaces

Cited by 40 publications

References 67 publications

High Spin Hall Conductivity in Large‐Area Type‐II Dirac Semimetal PtTe₂

High Spin Hall Conductivity in Large‐Area Type‐II Dirac Semimetal PtTe₂

Stimulating Oxide Heterostructures: A Review on Controlling SrTiO₃‐Based Heterointerfaces with External Stimuli

Light‐Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO₃(110) Heterointerfaces

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Optical Manipulation of Rashba Spin–Orbit Coupling at SrTiO3-Based Oxide Interfaces

Cited by 40 publications

References 67 publications

High Spin Hall Conductivity in Large‐Area Type‐II Dirac Semimetal PtTe2

High Spin Hall Conductivity in Large‐Area Type‐II Dirac Semimetal PtTe2

Stimulating Oxide Heterostructures: A Review on Controlling SrTiO3‐Based Heterointerfaces with External Stimuli

Light‐Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO3(110) Heterointerfaces

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Product

Resources

About

Optical Manipulation of Rashba Spin–Orbit Coupling at SrTiO₃-Based Oxide Interfaces

High Spin Hall Conductivity in Large‐Area Type‐II Dirac Semimetal PtTe₂

High Spin Hall Conductivity in Large‐Area Type‐II Dirac Semimetal PtTe₂

Stimulating Oxide Heterostructures: A Review on Controlling SrTiO₃‐Based Heterointerfaces with External Stimuli

Light‐Induced Giant Rashba Spin–Orbit Coupling at Superconducting KTaO₃(110) Heterointerfaces