title: Far-Field Spectroscopy and Near-Field Optical Imaging of Coupled Plasmon-Phonon Polaritons in 2D van der Waals Heterostructures.
abstract: A new hybridized plasmon-phonon polariton mode in graphene/h-BN van der Waals heterostructures is presented, featuring the ultrahigh field confinement characteristic of the graphene plasmon and the long lifetime property of the h-BN transverse optical phonon. This enables an ultralong hybrid plasmon lifetime of up to 1.6 ps (with ultrahigh mode confinement up to >l0(2)/7000 and ultrasmall group velocity down to 0.001c, where c is the speed of light in vacuum), superior to any localized plasmon ever demonstrated.
authors.affiliation: National Center for Nanoscience and Technology, Beijing, 100190, China.
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Yang
authors.affiliation: Department of Physics, Zhejiang Normal University, Jinhua, 321004, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Zhai
authors.affiliation: National Center for Nanoscience and Technology, Beijing, 100190, China.
authors.forename: Hai
authors.initials: H
authors.lastname: Hu
authors.affiliation: National Center for Nanoscience and Technology, Beijing, 100190, China.
authors.forename: Debo
authors.initials: D
authors.lastname: Hu
authors.affiliation: National Center for Nanoscience and Technology, Beijing, 100190, China.
authors.forename: Ruina
authors.initials: R
authors.lastname: Liu
authors.affiliation: Department of Physics, Wuhan University, Wuhan, 430072, China.
authors.forename: Shunping
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Institute of Physics, Chinese Academy of Science, and Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China.
authors.forename: Mengtao
authors.initials: M
authors.lastname: Sun
authors.affiliation: Department of Micro- and Nanosciences, Aalto University, Tietotie 3, FI-02150, Espoo, Finland.
authors.forename: Zhipei
authors.initials: Z
authors.lastname: Sun
authors.affiliation: Institute of Physics, Chinese Academy of Science, and Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China.
authors.forename: Jianing
authors.initials: J
authors.lastname: Chen
authors.affiliation: National Center for Nanoscience and Technology, Beijing, 100190, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Dai
keywords: graphene; monolayer h-BN; plasmon-phonon polaritons; van der Waals heterostructures