Ultra-confined plasmons reveal moiré patterns in a twisted bilayer graphene-talc heterostructure

被引：0

作者：

Barbosa, Tiago C. ^{[1
,2
]}

Chaves, Andre J. ^{[3
]}

Freitas, Raul O. ^{[4
]}

Campos, Leonardo C. ^{[1
,2
]}

Barcelos, Ingrid D. ^{[4
]}

机构：

[1] Univ Fed Minas Gerais UFMG, Dept Fis, BR-31270901 Belo Horizonte, MG, Brazil

[2] Univ Fed Minas Gerais, Ctr Tecnol Nanomat & Grafeno, BR-31270901 Belo Horizonte, MG, Brazil

[3] Aeronaut Inst Technol, Dept Phys, BR-12228900 Sao Jose Dos Campos, SP, Brazil

[4] Ctr Nacl Pesquisa Energia & Mat CNPEM, Lab Nacl Luz Sincrotron LNLS, BR-13083970 Campinas, SP, Brazil

来源：

NANOSCALE | 2025年 / 17卷 / 15期

基金：

巴西圣保罗研究基金会;

关键词：

ANGLE; MODES;

D O I：

10.1039/d4nr04532g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

This work investigates the plasmonic properties of a twisted bilayer graphene (TBG) and talc heterostructure. Talc, a naturally occurring phyllosilicate, promotes p-type charging of graphene, supporting high charge mobility and strong interaction between graphene plasmons and talc's phonon polaritons. This interaction results in the formation of surface plasmon-phonon polariton (SP3) modes, which are detected using infrared scattering-type scanning near-field optical microscopy (IR s-SNOM) at room temperature. Notably, without the need for electrostatic gating, our study reveals confinement of SP3 modes in a TBG-talc heterostructure and a transition from surface plasmonic waves to the emergence of moir & eacute; superlattices, characterized by reflections at domain walls. These findings provide fresh insights into the coupling mechanisms in hybrid materials and suggest promising applications in nanoscale optoelectronics.

引用

页码：9205 / 9212

页数：8