2019/11/30 by Luca Banszerus, L. Banszerus, Benedikt Frohn +22 · 68 citations
Chemistry · Materials Science · Physics and Astronomy · #Aerospace engineering #Ballistic conduction #Bilayer #Bilayer graphene #Chemistry #Condensed matter physics #Electron #Graphene #Graphene research and applications #Materials science #Membrane #Nanotechnology #Orbit (dynamics) #Physics #Quantum and electron transport phenomena #Quantum mechanics #Spin (aerodynamics) #Spin–orbit interaction #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.124.177701
published in Physical Review Letters 124(17), 177701 (American Physical Society) · 5 pages, 4 figures, Supplement 6 figures
arxiv created 2020/04/08 · openalex publication_date 2020/05/01 · arxiv updated 2020/05/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report on measurements of quantized conductance in gate-defined quantum point contacts in bilayer graphene that allow the observation of subband splittings due to spin-orbit coupling. The size of this splitting can be tuned from 40 to 80 μeV by the displacement field. We assign this gate-tunable subband splitting to a gap induced by spin-orbit coupling of Kane-Mele type, enhanced by proximity effects due to the substrate. We show that this spin-orbit coupling gives rise to a complex pattern in low perpendicular magnetic fields, increasing the Zeeman splitting in one valley and suppressing it in the other one. In addition, we observe a spin polarized channel of 6e2/h at high in-plane magnetic field and signatures of interaction effects at the crossings of spin-split subbands of opposite spins at finite magnetic field.