Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe
arXiv:2303.01018 · doi:10.1038/s41467-023-41826-1
Abstract
Van der Waals interactions with transition metal dichalcogenides was shown to induce strong spin-orbit coupling (SOC) in graphene, offering great promises to combine large experimental flexibility of graphene with unique tuning capabilities of the SOC that can rotate spin by moving electrons or vice versa. Here, we probe SOC-driven band splitting and electron dynamics in graphene on WSe by measuring ballistic transverse magnetic focusing. We found a clear splitting in the first focusing peak whose evolution in charge density and magnetic field is well reproduced by calculations using SOC strength of ~13 meV and no splitting in the second peak that indicates stronger Rashba SOC. A possible suppression of electron-electron scatterings was also found in temperature dependence measurement. Further, we found that Shubnikov-de Haas oscillations exhibit SOC strength of ~3.4 meV, suggesting that it probes different electron dynamics, calling for new theory. Our study demonstrates an interesting possibility to exploit ballistic electron motion pronounced in graphene for emerging spin-orbitronics.
20 pages, 6 figures
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- Spintronics in 2D graphene-based van der Waals heterostructures
- Spin Hall Effect: Symmetry Breaking, Twisting, and Giant Disorder Renormalization
- Probing miniband structure and Hofstadter butterfly in gated graphene superlattices via magnetotransport
- Coulomb drag in graphene/hBN/graphene moiré heterostructures
- Tunable spin-orbit splitting in bilayer graphene/WSe quantum devices
- Probing the Anisotropic Fermi Surface in Tetralayer Graphene via Transverse Magnetic Focusing
- Designing Topological High-Order Van Hove Singularities: Twisted Bilayer Kagomé
- Ultra-Fast All-Electrical Universal Nano-Qubits
- Landau-level spectrum and the effect of spin-orbit coupling in monolayer graphene on transition metal dichalcogenides
- Designer spin-orbit superlattices: symmetry-protected Dirac cones and spin Berry curvature in two-dimensional van der Waals metamaterials
- Dirac-Rashba fermions and quantum valley Hall insulators in graphene-based 2D heterostructures
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- Chern junctions in Moiré-Patterned Graphene/PbI2