Optospintronics in graphene via proximity coupling

Abstract

The observation of micron size spin relaxation makes graphene a promising material for applications in spintronics requiring long distance spin communication. However, spin dependent scatterings at the contact/graphene interfaces affect the spin injection efficiencies and hence prevent the material from achieving its full potential. While this major issue could be eliminated by nondestructive direct optical spin injection schemes, graphenes intrinsically low spin orbit coupling strength and optical absorption place an obstacle in their realization. We overcome this challenge by creating sharp artificial interfaces between graphene and WSe2 monolayers. Application of a circularly polarized light activates the spin polarized charge carriers in the WSe2 layer due to its spin coupled valley selective absorption. These carriers diffuse into the superjacent graphene layer, transport over a 3.5 um distance, and are finally detected electrically using BN/Co contacts in a non local geometry. Polarization dependent measurements confirm the spin origin of the non local signal.

References in corpus (32)

• Spintronics: Fundamentals and applications
• Control of valley polarization in monolayer MoS2 by optical helicity
• Valley polarization in MoS2 monolayers by optical pumping
• Electronic spin transport and spin precession in single graphene layers at room temperature
• Basic obstacle for electrical spin-injection from a ferromagnetic metal into a diffusive semiconductor
• Micrometer-scale ballistic transport in encapsulated graphene at room temperature
• Graphene Spintronics
• Measurement of the optical dielectric function of transition metal dichalcogenide monolayers: MoS2, MoSe2, WS2 and WSe2
• Spin qubits in graphene quantum dots
• Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2
• Band-structure topologies of graphene: spin-orbit coupling effects from first principles
• Tunneling Spin Injection into Single Layer Graphene (Supplementary Information)
• Tunneling Spin Injection into Single Layer Graphene
• Spin Injection and Detection in Magnetic Nanostructures
• Graphene on transition-metal dichalcogenides: a platform for proximity spin-orbit physics and optospintronics
• Long-lived nanosecond spin relaxation and spin coherence of electrons in monolayer MoS_2 and WS_2
• WSe2 light-emitting tunneling transistors with enhanced brightness at room temperature
• Spin lifetimes exceeding 12 nanoseconds in graphene non-local spin valve devices
• Towards wafer scale fabrication of graphene based spin valve devices
• Opto-Valleytronic Spin Injection in Monolayer MoS2/Few-Layer Graphene Hybrid Spin Valves
• Anisotropic spin relaxation in graphene
• A two-dimensional spin field-effect transistor
• Valley Polarization by Spin Injection in a Light-Emitting van der Waals Heterojunction
• Gate-tunable black phosphorus spin valve with nanosecond spin lifetimes
• What Makes Effective Gating Possible in Two-Dimensional Heterostructures?
• 24 \textmu m length spin relaxation length in boron nitride encapsulated bilayer graphene
• Imaging Spin Dynamics in Monolayer WS2 by Time-Resolved Kerr Rotation Microscopy
• Marrying excitons and plasmons in monolayer transition-metal dichalcogenides
• Dynamical screening in monolayer transition-metal dichalcogenides and its manifestations in the exciton spectrum
• Electronic Spin Transport in Dual-Gated Bilayer Graphene
• All-optical injection of charge, spin and valley currents in monolayer transition metal dichalcogenides
• Reconfigurable nanoelectronics using graphene based spintronic logic gates

Cited by in corpus (47)

• Van der Waals heterostructures for spintronics and opto-spintronics
• Colloquium: Spintronics in graphene and other two-dimensional materials
• Strongly anisotropic spin relaxation in graphene/transition metal dichalcogenide heterostructures at room temperature
• Charge-to-Spin Conversion by the Rashba-Edelstein Effect in 2D van der Waals Heterostructures up to Room Temperature
• Large Proximity-Induced Spin Lifetime Anisotropy in Transition Metal Dichalcogenide/Graphene Heterostructures
• Proximity exchange effects in MoSe${}_2$ and WSe${}_2$ heterostructures with CrI${}_3$: twist angle, layer, and gate dependence
• Strain-tunable orbital, spin-orbit, and optical properties of monolayer transition-metal dichalcogenides
• Filtering the photoluminescence spectra of atomically thin semiconductors with graphene
• Accessing high optical quality of MoS2 monolayers grown by chemical vapor deposition
• Orbital Hall Insulating Phase in Transition Metal Dichalcogenide Monolayers
• Revealing Hidden Orbital Pseudospin Texture with Time-Reversal Dichroism in Photoelectron Angular Distributions
• Protected pseudohelical edge states in proximity graphene ribbons and flakes
• Electrical control of valley-Zeeman spin-orbit coupling-induced spin precession at room temperature
• Electrical spin injection, transport, and detection in graphene-hexagonal boron nitride van der Waals heterostructures: progress and perspectives
• Strong and Tunable Spin Lifetime Anisotropy in Dual-Gated Bilayer Graphene
• Observation of spin-valley coupling induced large spin lifetime anisotropy in bilayer graphene
• Gate-Tunable Reversible Rashba-Edelstein Effect in a Few-Layer Graphene/2H-TaS2 Heterostructure at Room Temperature
• Electrically tunable exchange splitting in bilayer graphene on monolayer Cr${}_2$X${}_2$Te${}_6$ with X=Ge, Si, and Sn
• Swapping Exchange and Spin-Orbit Coupling in 2D van der Waals Heterostructures
• Room Temperature Valley Polarization and Coherence in Transition Metal Dichalcogenide-Graphene van der Waals Heterostructures
• Twist- and gate-tunable proximity spin-orbit coupling, spin relaxation anisotropy, and charge-to-spin conversion in heterostructures of graphene and transition-metal dichalcogenides
• Giant proximity exchange and valley splitting in transition metal dichalcogenide/$h\mathrm{BN}$/(Co, Ni) heterostructures
• Electrically Controlled Spin Injection from Giant Rashba Spin-Orbit Conductor BiTeBr
• Mechanisms of quasi-van der Waals epitaxy of 3D metallic nanoislands on suspended 2D materials
• Bilayer graphene encapsulated within monolayers of WS${}_2$ or Cr${}_2$Ge${}_2$Te${}_6$: Tunable proximity spin-orbit or exchange coupling
• Crystal-field effects in graphene with interface-induced spin-orbit coupling
• Effective Interactions in a Graphene Layer Induced by the Proximity to a Ferromagnet
• Resonant scattering due to adatoms in graphene: top, bridge, and hollow position
• Proximity spin-orbit and exchange coupling in ABA and ABC trilayer graphene van der Waals heterostructures
• Quantum Hall Effect in Graphene with Interface-Induced Spin-Orbit Coupling
• Single and bilayer graphene on the topological insulator Bi${}_2$Se${}_3$: Electronic and spin-orbit properties from first principles
• Symmetry and Control of Spin-Scattering Processes in Two-Dimensional Transition Metal Dichalcogenides
• Large spin-relaxation anisotropy in bilayer-graphene/WS${}_2$ heterostructures
• Signatures of electric field and layer separation effects on the spin-valley physics of MoSe${}_2$/WSe${}_2$ heterobilayers: from energy bands to dipolar excitons
• Unambiguous Electrical Detection of Spin-Charge Conversion in Lateral Spin-Valves
• Thermal Transport in Amorphous Graphene with Varying Structural Quality
• Exchange-bias controlled correlations in magnetically encapsulated twisted van der Waals dichalcogenides
• Spin-orbit correlations and exchange-bias control in twisted Janus dichalcogenide multilayers
• Modeling the Oblique Spin Precession in Lateral Spin Valves for Accurate Determination of Spin Lifetime Anisotropy: Effect of Finite Contact Resistance and Channel Length
• Proximity-enhanced valley Zeeman splitting at the WS${}_2$/graphene interface
• Theory of spin-charge-coupled transport in proximitized graphene: An SO(5) algebraic approach
• Theory of Spin Injection in Two-dimensional Metals with Proximity-Induced Spin-Orbit Coupling
• Single- and narrow-line photoluminescence in a boron nitride-supported MoSe${}_2$/graphene heterostructure
• Interface Magnetism in Vanadium-doped MoS${}_2$/Graphene Heterostructures
• Dielectric environment engineering via 2D material heterostructure formation on hybrid photonic crystal nanocavity
• Topological Optical Pseudospin Injection Beyond Weyl Semimetals
• Effect of YIG Nanoparticle Size and Clustering in Proximity-Induced Magnetism in Graphene/YIG Composite Probed with Magnetoimpedance Sensors: Towards Improved Functionality, Sensitivity and Proximity Detection