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Linewidth Narrowing with Ultimate Confinement of an Alkali Multipole Plasmon by Modifying Surface Electronic Wave Functions with Two-Dimensional Materials (CROSBI ID 283333)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Tanaka Shunsuke ; Yoshida Tatsuya ; Watanabe Kazuya ; Matsumoto Yoshiyasu ; Yasuike Tomokazu ; Petrović Marin ; Kralj Marko Linewidth Narrowing with Ultimate Confinement of an Alkali Multipole Plasmon by Modifying Surface Electronic Wave Functions with Two-Dimensional Materials // Physical review letters, 125 (2020), 126802, 6. doi: 10.1103/PhysRevLett.125.126802

Podaci o odgovornosti

Tanaka Shunsuke ; Yoshida Tatsuya ; Watanabe Kazuya ; Matsumoto Yoshiyasu ; Yasuike Tomokazu ; Petrović Marin ; Kralj Marko

engleski

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

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 ~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.

plasmon ; multipole plasmon ; graphene ; hexagonal boron nitride ; alkali

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Podaci o izdanju

125

2020.

126802

6

objavljeno

0031-9007

1079-7114

10.1103/PhysRevLett.125.126802

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