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Determining spin-orbit coupling in graphene by quasiparticle interference imaging

Published on July 7, 2023

We deploy quasi-particle interference imaging using a scanning tunneling microscope to probe the presence, nature and strength of proximity induced spin-orbit coupling (SOC) in single layer graphene (SLG) on WSe2. In the presence of SOC, the pseudo-spin texture is modified, enabling intravalley backscattering normally forbidden in SLG. This backscattering is detected by a characteristic small momentum ring around the gamma point in the Fourier transforms of conductance maps. Fitting the intensity of this ring to a weak coupling Hamiltonian, we can identify the contribution of a Rashba and a valley-Zeeman SOC term, and exclude the contribution of a mass gap to the observed intravalley backscattering.

Collaboration with Alberto Morpurgo and Louk Rademaker, University of Geneva.


Lihuan Sun, Louk Rademaker, Diego Mauro, Alessandro Scarfato, Árpád Pásztor, Ignacio Gutiérrez-Lezama, Zhe Wang, Jose Martinez-Castro, Alberto F. Morpurgo, Christoph Renner

See this publication on UNIGE