論文

2020年9月

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

PHYSICAL REVIEW LETTERS
  • Shunsuke Tanaka
  • ,
  • Tatsuya Yoshida
  • ,
  • Kazuya Watanabe
  • ,
  • Yoshiyasu Matsumoto
  • ,
  • Tomokazu Yasuike
  • ,
  • Marin Petrovic
  • ,
  • Marko Kralj

125
12
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevLett.125.126802
出版者・発行元
AMER PHYSICAL SOC

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 similar to 2 eV, 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 10(5) 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.


リンク情報
DOI
https://doi.org/10.1103/PhysRevLett.125.126802
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000570982600011&DestApp=WOS_CPL
ID情報
  • DOI : 10.1103/PhysRevLett.125.126802
  • ISSN : 0031-9007
  • eISSN : 1079-7114
  • Web of Science ID : WOS:000570982600011

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