Linewidth Narrowing with Ultimate Confinement of an Alkali Multipole Plasmon by Modifying Surface Electronic Wave Functions with Two-Dimensional Materials

Shunsuke Tanaka, Tatsuya Yoshida, Kazuya Watanabe, Yoshiyasu Matsumoto, Tomokazu Yasuike, Marin Petrović, and Marko Kralj
Phys. Rev. Lett. 125, 126802 – Published 18 September 2020
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Abstract

This work demonstrates significant line narrowing of a surface multipole plasmon (MP) by modifying the surface electronic wave function with two-dimensional materials (2DMs): graphene and hexagonal boron nitride. This is found in an optical reflectivity of alkali atoms (Cs or K) on an Ir(111) surface covered with the 2DMs. The reduction in reflectivity induced by deposition of the alkali atoms becomes as large as 20% at 2eV, which is ascribed to a MP of a composite of alkali/2DM/alkali/Ir multilayer structure. The linewidth of the MP band becomes as narrow as 0.2 eV by the presence of the 2DM between the two alkali layers. A numerical simulation by time-dependent density functional theory with a jellium model reveals that the density of states of the surface localized state is sharpened remarkably by the 2DMs that decouple the outermost alkali layer from the Ir bulk. Consequently, a local field enhancement of an order of 105 is achieved by ultimate confinement of the MP within the outermost alkali layer. This work leads to a novel strategy for reducing plasmon dissipation in an atomically thin layer via atomic scale modification of surface structure.

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  • Received 21 March 2020
  • Accepted 10 August 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.126802

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Shunsuke Tanaka1, Tatsuya Yoshida1, Kazuya Watanabe1,*, Yoshiyasu Matsumoto1, Tomokazu Yasuike2,3,†, Marin Petrović4, and Marko Kralj4

  • 1Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • 2Department of Liberal Arts, The Open University of Japan, Chiba 261-8586, Japan
  • 3Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Kyoto 615-8520, Japan
  • 4Center of Excellence for Advanced Materials and Sensing Devices, Institute of Physics, Bijenička 46, 10000 Zagreb, Croatia

  • *kw@kuchem.kyoto-u.ac.jp
  • yasuike@ouj.ac.jp

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Issue

Vol. 125, Iss. 12 — 18 September 2020

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