title: Resonance shifts and spill-out effects in self-consistent hydrodynamic nanoplasmonics.
abstract: The standard hydrodynamic Drude model with hard-wall boundary conditions can give accurate quantitative predictions for the optical response of noble-metal nanoparticles. However, it is less accurate for other metallic nanosystems, where surface effects due to electron density spill-out in free space cannot be neglected. Here we address the fundamental question whether the description of surface effects in plasmonics necessarily requires a fully quantum-mechanical ab initio approach. We present a self-consistent hydrodynamic model (SC-HDM), where both the ground state and the excited state properties of an inhomogeneous electron gas can be determined. With this method we are able to explain the size-dependent surface resonance shifts of Na and Ag nanowires and nanospheres. The results we obtain are in good agreement with experiments and more advanced quantum methods. The SC-HDM gives accurate results with modest computational effort, and can be applied to arbitrary nanoplasmonic systems of much larger sizes than accessible with ab initio methods.
authors.affiliation: 1] Center for Nanoscience and Nanotechnology, School of Physics and Technology, and Institute for Advanced Studies, Wuhan University, Wuhan 430072, China [2] Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Toscano
authors.affiliation: Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany.
authors.forename: Jakob
authors.initials: J
authors.lastname: Straubel
authors.affiliation: Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Kwiatkowski
authors.affiliation: 1] Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany [2] Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76021 Eggenstein-Leopoldshafen, Germany.
authors.forename: Carsten
authors.initials: C
authors.lastname: Rockstuhl
authors.affiliation: 1] Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76021 Eggenstein-Leopoldshafen, Germany [2] Institut I-Theoretische Physik, Universität Regensburg, Universitätsstraβe 31, D-93053 Regensburg, Germany.
authors.forename: Ferdinand
authors.initials: F
authors.lastname: Evers
authors.affiliation: 1] Center for Nanoscience and Nanotechnology, School of Physics and Technology, and Institute for Advanced Studies, Wuhan University, Wuhan 430072, China [2] Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Hongxing
authors.initials: H
authors.lastname: Xu
authors.affiliation: 1] DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark [2] Center for Nanostructured Graphene (CNG), Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
authors.forename: N Asger
authors.identifier: 0000000179366264
authors.initials: NA
authors.lastname: Mortensen
authors.affiliation: 1] DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark [2] Center for Nanostructured Graphene (CNG), Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
authors.forename: Martijn
authors.identifier: 0000000282867825
authors.initials: M
authors.lastname: Wubs