title: Visible Surface Plasmon Modes in Single Bi₂Te₃ Nanoplate.
abstract: Searching for new plasmonic building blocks which offer tunability and design flexibility beyond noble metals is crucial for advancing the field of plasmonics. Herein, we report that solution-synthesized hexagonal Bi2Te3 nanoplates, in the absence of grating configurations, can exhibit multiple plasmon modes covering the entire visible range, as observed by transmission electron microscopy (TEM)-based electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL) spectroscopy. Moreover, different plasmon modes are observed in the center and edge of the single Bi2Te3 nanoplate and a breathing mode is discovered for the first time in a non-noble metal. Theoretical calculations show that the plasmons observed in the visible range are mainly due to strong spin-orbit coupling induced metallic surface states of Bi2Te3. The versatility of shape- and size-engineered Bi2Te3 nanocrystals suggests exciting possibilities in plasmonics-enabled technology.
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, 117543, Singapore.|Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore , 6 Science Drive 2, 117546, Singapore.
authors.forename: Meng
authors.initials: M
authors.lastname: Zhao
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , 2 Fusionopolis Way, 138634, Singapore.
authors.forename: Michel
authors.initials: M
authors.lastname: Bosman
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore , 4 Engineering Drive 3, 117583, Singapore.|Electronics and Photonics Department, Institute of High Performance Computing , 1 Fusionopolis Way, 138632, Singapore.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Danesh
authors.affiliation: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore , 6 Science Drive 2, 117546, Singapore.|Department of Physics, National University of Singapore , 2 Science Drive 3, 117542, Singapore.
authors.forename: Minggang
authors.initials: M
authors.lastname: Zeng
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, 117543, Singapore.|Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore , 6 Science Drive 2, 117546, Singapore.
authors.forename: Peng
authors.initials: P
authors.lastname: Song
authors.affiliation: Department of Physics, National University of Singapore , 2 Science Drive 3, 117542, Singapore.|Singapore Synchrotron Light Source, National University of Singapore , 5 Research Link, 117603, Singapore.
authors.forename: Yudi
authors.initials: Y
authors.lastname: Darma
authors.affiliation: Department of Physics, National University of Singapore , 2 Science Drive 3, 117542, Singapore.|Singapore Synchrotron Light Source, National University of Singapore , 5 Research Link, 117603, Singapore.
authors.forename: Andrivo
authors.initials: A
authors.lastname: Rusydi
authors.affiliation: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore , 6 Science Drive 2, 117546, Singapore.|Department of Physics, National University of Singapore , 2 Science Drive 3, 117542, Singapore.
authors.forename: Hsin
authors.initials: H
authors.lastname: Lin
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore , 4 Engineering Drive 3, 117583, Singapore.
authors.forename: Cheng-Wei
authors.initials: CW
authors.lastname: Qiu
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, 117543, Singapore.|Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore , 6 Science Drive 2, 117546, Singapore.
authors.forename: Kian Ping
authors.initials: KP
authors.lastname: Loh
keywords: Bi2Te3; cathodoluminescence; electron energy-loss spectroscopy; spin−orbit coupling; surface plasmon; visible