title: Quasiparticle interference of the Fermi arcs and surface-bulk connectivity of a Weyl semimetal.
abstract: Weyl semimetals host topologically protected surface states, with arced Fermi surface contours that are predicted to propagate through the bulk when their momentum matches that of the surface projections of the bulk's Weyl nodes. We used spectroscopic mapping with a scanning tunneling microscope to visualize quasiparticle scattering and interference at the surface of the Weyl semimetal TaAs. Our measurements reveal 10 different scattering wave vectors, which can be understood and precisely reproduced with a theory that takes into account the shape, spin texture, and momentum-dependent propagation of the Fermi arc surface states into the bulk. Our findings provide evidence that Weyl nodes act as sinks for electron transport on the surface of these materials.
authors.affiliation: Joseph Henry Laboratories of Physics, Department of Physics, Princeton University, Princeton, NJ 08540, USA.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Inoue
authors.affiliation: Joseph Henry Laboratories of Physics, Department of Physics, Princeton University, Princeton, NJ 08540, USA.
authors.forename: András
authors.initials: A
authors.lastname: Gyenis
authors.affiliation: Joseph Henry Laboratories of Physics, Department of Physics, Princeton University, Princeton, NJ 08540, USA.
authors.forename: Zhijun
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Joseph Henry Laboratories of Physics, Department of Physics, Princeton University, Princeton, NJ 08540, USA.
authors.forename: Jian
authors.initials: J
authors.lastname: Li
authors.affiliation: Joseph Henry Laboratories of Physics, Department of Physics, Princeton University, Princeton, NJ 08540, USA.
authors.forename: Seong Woo
authors.initials: SW
authors.lastname: Oh
authors.affiliation: Department of Physics and Astronomy and California NanoSystems Institute, University of California at Los Angeles, Los Angeles, CA 90095, USA.
authors.forename: Shan
authors.initials: S
authors.lastname: Jiang
authors.affiliation: Department of Physics and Astronomy and California NanoSystems Institute, University of California at Los Angeles, Los Angeles, CA 90095, USA.
authors.forename: Ni
authors.initials: N
authors.lastname: Ni
authors.affiliation: Joseph Henry Laboratories of Physics, Department of Physics, Princeton University, Princeton, NJ 08540, USA.
authors.forename: B Andrei
authors.initials: BA
authors.lastname: Bernevig
authors.affiliation: Joseph Henry Laboratories of Physics, Department of Physics, Princeton University, Princeton, NJ 08540, USA. yazdani@princeton.edu.
authors.forename: Ali
authors.initials: A
authors.lastname: Yazdani