Room-temperature anisotropic in-plane spin dynamics in graphene induced by PdSe${}_2$ proximity

Abstract

Van der Waals heterostructures offer a versatile platform for tailoring electrical, magnetic, optical, and spin transport properties of materials through proximity effects. Notably, hexagonal transition metal dichalcogenides have been shown to induce valley-Zeeman spin-orbit coupling (SOC) in graphene, resulting in significant spin lifetime anisotropy between in-plane and out-of-plane spin orientations. However, in-plane lifetimes remain isotropic due to the inherent threefold symmetry of the heterostructure. Here, we demonstrate that pentagonal PdSe${}_2$, characterised by unique in-plane anisotropy, induces an unprecedented gate-tunable SOC in graphene. Our measurements reveal a remarkable 10-fold modulation of the spin lifetime for spins oriented within the graphene plane at room temperature. Moreover, the directional dependence of the spin lifetimes, along the three spatial directions, suggests the existence of a persistent in-plane spin texture component that dominates the spin dynamics. These findings deepen our understanding of spin dynamics in van der Waals heterostructures and open avenues for designing and engineering novel topological phases in graphene-based heterostructures within the strong SOC regime.

References in corpus (37)

• Topological Insulators
• Topological insulators and superconductors
• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Spin-orbit qubit in a semiconductor nanowire
• Recent progress in the assembly of nanodevices and van der Waals heterostructures by deterministic placement of 2D materials
• Van der Waals heterostructures for spintronics and opto-spintronics
• From Andreev to Majorana bound states in hybrid superconductor-semiconductor nanowires
• Strong interface-induced spin-orbit coupling in graphene on WS2
• Graphene on transition-metal dichalcogenides: a platform for proximity spin-orbit physics and optospintronics
• Trivial and inverted Dirac bands, and emergence of quantum spin Hall states in graphene on transition-metal dichalcogenides
• Layer-Resolved Magnetic Proximity Effect in van der Waals Heterostructures
• Room temperature spin Hall effect in graphene/MoS${}_2$ van der Waals heterostructures
• 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
• Giant Spin Lifetime Anisotropy in Graphene Induced by Proximity Effects
• Spin-Orbit Enhanced Superconductivity in Bernal Bilayer Graphene
• Large Proximity-Induced Spin Lifetime Anisotropy in Transition Metal Dichalcogenide/Graphene Heterostructures
• A two-dimensional spin field-effect transistor
• Tunable room-temperature spin galvanic and spin Hall effects in van der Waals heterostructures
• Electrical and Thermal Generation of Spin Currents by Magnetic Graphene
• Unconventional charge-spin conversion in Weyl-semimetal WTe2
• Induced spin-orbit coupling in twisted graphene-TMDC heterobilayers: twistronics meets spintronics
• Strong Spin-Orbit Interaction Induced in Graphene by Monolayer WS${}_2$
• Large multi-directional spin-to-charge conversion in low symmetry semimetal MoTe${}_2$ at room temperature
• Determination of the spin-lifetime anisotropy in graphene using oblique spin precession
• Interplay between spin proximity effect and charge-dependent exciton dynamics in MoSe${}_2$ / CrBr${}_3$ van der Waals heterostructures
• Quantum Hall Effect Measurement of Spin-Orbit Coupling Strengths in Ultraclean Bilayer Graphene/WSe2 Heterostructures
• Gate tunability of highly efficient spin-to-charge conversion by spin Hall effect in graphene proximitized with WSe${}_2$
• Spin precession in anisotropic media
• Microscopic Theory of Spin Relaxation Anisotropy in Graphene with Proximity-Induced Spin-Orbit Coupling
• Highly anisotropic spin transport in ultrathin black phosphorus
• Low-symmetry topological materials for large charge-to-spin interconversion: The case of transition metal dichalcogenide monolayers
• Resolving spin currents and spin densities generated by charge-spin interconversion in systems with reduced crystal symmetry
• Electric Dipole Spin Resonance of 2D Semiconductor Spin Qubits
• Spin Hall and inverse spin galvanic effects in graphene with strong interfacial spin-orbit coupling: a quasi-classical Green's function approach
• Giant asymmetric proximity-induced spin-orbit coupling in twisted graphene/SnTe heterostructure
• Terahertz Spin-Light Coupling in Proximitized Dirac Materials

Cited by in corpus (5)

• High-throughput calculations of spin Hall conductivity in non-magnetic 2D materials
• Room-temperature spin-lifetime anisotropy exceeding 60 in bilayer graphene spin valves proximity coupled to WSe${}_2$
• Gate tunable spin-charge interconversion in a graphene/ReS${}_2$ heterostructure up to room temperature
• Hanle lineshapes and spin-rotation signatures from in-plane anisotropic spin relaxation in heterogeneous spin devices
• Unprecedented Spin-Lifetime of Itinerant Electrons in Natural Graphite Crystals