title: Substrate carrier concentration dependent plasmon-phonon coupled modes at the interface between graphene and semiconductors.
abstract: The coupled modes between graphene plasmons and surface phonons of a semiconductor substrate are investigated, which can be efficiently controlled by carrier injection of the substrate. A new physical mechanism on tuning plasmon-phonon coupled modes (PPCMs) is proposed due to the fact that the energy and lifetime of substrate surface phonons depend a lot on the carrier concentration. Specifically, the change of dispersion and lifetime of PPCMs can be controlled by the carrier concentration of the substrate. The energy of PPCMs for a given momentum increases as the carrier concentration of the substrate increases. On the other hand, the momentum of PPCMs for a given energy decreases when the carrier concentration of the substrate increases. The lifetime of PPCMs is always larger than the intrinsic lifetime of graphene plasmons without plasmon-phonon coupling.
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Cai
authors.forename: Linyu
authors.initials: L
authors.lastname: Niu
authors.forename: Weiwei
authors.initials: W
authors.lastname: Luo
authors.forename: Zenghong
authors.initials: Z
authors.lastname: Ma
authors.forename: Chenglin
authors.initials: C
authors.lastname: Du
authors.forename: Shuqing
authors.initials: S
authors.lastname: Xue
authors.forename: Xinzheng
authors.initials: X
authors.lastname: Zhang
authors.forename: Jingjun
authors.initials: J
authors.lastname: Xu