title: Tunable Plasmonic Reflection by Bound 1D Electron States in a 2D Dirac Metal.
abstract: We show that the surface plasmons of a two-dimensional Dirac metal such as graphene can be reflected by linelike perturbations hosting one-dimensional electron states. The reflection originates from a strong enhancement of the local optical conductivity caused by optical transitions involving these bound states. We propose that the bound states can be systematically created, controlled, and liquidated by an ultranarrow electrostatic gate. Using infrared nanoimaging, we obtain experimental evidence for the locally enhanced conductivity of graphene induced by a carbon nanotube gate, which supports this theoretical concept.
authors: Department of Physics, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA.
authors: B-Y
authors: BY
authors: Jiang
authors: Department of Physics, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA.
authors: G X
authors: GX
authors: Ni
authors: Department of Physics, University of California Riverside, 900 University Avenue, Riverside, California 92521, USA.
authors: C
authors: C
authors: Pan
authors: Department of Physics, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA.|Department of Physics, Iowa State University, 2334 Pammel Drive, Ames, Iowa 50011, USA.
authors: Z
authors: Z
authors: Fei
authors: Department of Physics, University of California Riverside, 900 University Avenue, Riverside, California 92521, USA.
authors: B
authors: B
authors: Cheng
authors: Department of Physics, University of California Riverside, 900 University Avenue, Riverside, California 92521, USA.
authors: C N
authors: CN
authors: Lau
authors: Department of Physics, University of California Riverside, 900 University Avenue, Riverside, California 92521, USA.
authors: M
authors: M
authors: Bockrath
authors: Department of Physics, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA.|Department of Physics, Columbia University, New York, New York 10027, USA.
authors: D N
authors: DN
authors: Basov
authors: Department of Physics, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA.
authors: M M
authors: MM
authors: Fogler