title: Ballistic collective group delay and its Goos-Hänchen component in graphene.
abstract: We theoretically construct an experimental observable for the ballistic collective group delay (CGD) of all the particles on the Fermi surface in graphene. First, we reveal that lateral Goos-Hänchen (GH) shifts along barrier interfaces contribute an inherent component in the individual group delay (IGD). Then, by linking the complete IGD to spin precession through a dwell time, we suggest that the CGD and its GH component can be electrostatically measured by the conductance difference in a spin precession experiment under weak magnetic fields. Such an approach is feasible for almost any Fermi energy. We also indicate that it is a generally nonzero self-interference delay that relates the IGD to the dwell time in graphene.
authors.affiliation: Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, People's Republic of China. kwungyusung@gmail.com
authors.forename: Yu
authors.initials: Y
authors.lastname: Song
authors.forename: Han-Chun
authors.initials: HC
authors.lastname: Wu
mesh_terms: D016880:Anisotropy; D003198:Computer Simulation; D004574:Electromagnetic Fields; D006108:Graphite / Q000737:chemistry*; D008422:Materials Testing; D008956:Models, Chemical; D008958:Models, Molecular
chemical_list: D006108:Graphite