Determining spin-orbit coupling in graphene by quasiparticle interference imaging

Article Article scientifique Article Determining spin-orbit coupling in graphene by quasiparticle interference imaging eng 2023-06-24 2023-06-24 author Sun Lihuan 0000-0002-4259-3313 928478 Département de physique de la matière quantique (FIMAC) author Rademaker Louk 0000-0001-6053-8150 906528 Département de physique de la matière quantique (FIMAC) author Mauro Diego 839317 author Scarfato Alessandro 0000-0002-5615-766X 780440 MaNEP DIP (MANSC) author Pasztor Arpad 0000-0001-8230-235X 814093 Département de physique de la matière quantique (FIMAC) author Gutierrez Lezama Ignacio 0000-0003-1280-915X 681297 Département de physique de la matière quantique (FIMAC) author Wang Zhen 0000-0001-5664-2932 815990 author Martinez Castro José 0000-0001-7249-2567 851450 author Morpurgo Alberto 0000-0003-0974-3620 666794 Département de physique de la matière quantique (FIMAC) author Renner Christoph 0000-0001-9882-681X 24186 Département de physique de la matière quantique (FIMAC) 3771 10.1038/s41467-023-39453-x 2041-1723 https://www.nature.com/articles/s41467-023-39453-x Inducing and controlling spin-orbit coupling (SOC) in graphene is key to create topological states of matter, and for the realization of spintronic devices. Placing graphene onto a transition metal dichalcogenide is currently the most successful strategy to achieve this goal, but there is no consensus as to the nature and the magnitude of the induced SOC. Here, we show that the presence of backscattering in graphene-on-WSe 2 heterostructures can be used to probe SOC and to determine its strength quantitatively, by imaging quasiparticle interference with a scanning tunneling microscope. A detailed theoretical analysis of the Fourier transform of quasiparticle interference images reveals that the induced SOC consists of a valley-Zeeman ( λ vZ ≈ 2 meV) and a Rashba ( λ R ≈ 15 meV) term, one order of magnitude larger than what theory predicts, but in excellent agreement with earlier transport experiments. The validity of our analysis is confirmed by measurements on a 30 degree twist angle heterostructure that exhibits no backscattering, as expected from symmetry considerations. Our results demonstrate a viable strategy to determine SOC quantitatively by imaging quasiparticle interference. Dewey 500.2 Swiss National Science Foundation Electron matter in correlated electron systems 182652 CH Projects 33 Département de physique de la matière quantique 131 false 783 Groupe Renner 678 Groupe Morpurgo 1403 Groupe Rademaker https://doi.org/10.26037/yareta:p45pwzleczgidm4buoiuuqxw3e Nature communications 14 1 959097c5-2b3c-42a0-bac9-152511252c2c Article (Published version) Public Article-scientifique-from-crossref.pdf 3015254 application/pdf CC BY-4.0 ffccbbea4d265190d9efb13e41df0a8c91043fe2f8bd899cf3ab39a2c4b1712b Vignette Public Image1.png 54915 openAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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Determining spin-orbit coupling in graphene by quasiparticle interference imaging	Nature communications			2023	386	72

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