TY - JOUR
T1 - Tunable Plasmons in Large-Area WTe2 Thin Films
AU - Wang, Chong
AU - Sun, Yangye
AU - Huang, Shenyang
AU - Xing, Qiaoxia
AU - Zhang, Guowei
AU - Song, Chaoyu
AU - Wang, Fanjie
AU - Xie, Yuangang
AU - Lei, Yuchen
AU - Sun, Zhengzong
AU - Yan, Hugen
N1 - Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/1/7
Y1 - 2021/1/7
N2 - The observation of electrically tunable and highly confined plasmons in graphene has stimulated the exploration of interesting properties of plasmons in other two-dimensional materials. Recently, hyperbolic plasmon resonance modes have been observed in exfoliated WTe2 films, a type-II Weyl semimetal with layered structure, providing a platform for the assembly of plasmons with hyperbolicity and exotic topological properties. However, the plasmon modes were observed in relatively thick and small-area films, which restrict the tunability and application for plasmons. Here, large-area (approximately cm) WTe2 films with different thicknesses are grown by the chemical vapor deposition method, in which plasmon resonance modes are observed in films with different thicknesses down to about 8 nm. Hybridization of plasmon and surface polar phonons of the substrate is revealed by mapping the plasmon dispersion. The plasmon frequency is demonstrated to be tunable by changing the temperature and film thickness. Our results facilitate the development of a tunable and scalable WTe2 plasmonic system for revealing topological properties and towards various applications in sensing, imaging, and light modulation.
AB - The observation of electrically tunable and highly confined plasmons in graphene has stimulated the exploration of interesting properties of plasmons in other two-dimensional materials. Recently, hyperbolic plasmon resonance modes have been observed in exfoliated WTe2 films, a type-II Weyl semimetal with layered structure, providing a platform for the assembly of plasmons with hyperbolicity and exotic topological properties. However, the plasmon modes were observed in relatively thick and small-area films, which restrict the tunability and application for plasmons. Here, large-area (approximately cm) WTe2 films with different thicknesses are grown by the chemical vapor deposition method, in which plasmon resonance modes are observed in films with different thicknesses down to about 8 nm. Hybridization of plasmon and surface polar phonons of the substrate is revealed by mapping the plasmon dispersion. The plasmon frequency is demonstrated to be tunable by changing the temperature and film thickness. Our results facilitate the development of a tunable and scalable WTe2 plasmonic system for revealing topological properties and towards various applications in sensing, imaging, and light modulation.
UR - http://www.scopus.com/inward/record.url?scp=85100115421&partnerID=8YFLogxK
U2 - 10.1103/PhysRevApplied.15.014010
DO - 10.1103/PhysRevApplied.15.014010
M3 - Article
AN - SCOPUS:85100115421
SN - 2331-7019
VL - 15
JO - Physical Review Applied
JF - Physical Review Applied
IS - 1
M1 - 014010
ER -