title: A tunable phonon-exciton Fano system in bilayer graphene.
abstract: Fano resonances are features in absorption, scattering or transport spectra resulting from the interaction of discrete and continuum states. They have been observed in a variety of systems. Here, we report a many-body Fano resonance in bilayer graphene that is continuously tunable by means of electrical gating. Discrete phonons and continuous exciton (electron-hole pair) transitions are coupled by electron-phonon interactions, yielding a new hybrid phonon-exciton excited state. It may also be possible to control the phonon-exciton coupling with an optical field. This tunable phonon-exciton system could allow novel applications such as phonon lasers.
authors.affiliation: Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
authors.forename: Tsung-Ta
authors.initials: TT
authors.lastname: Tang
authors.forename: Yuanbo
authors.initials: Y
authors.lastname: Zhang
authors.forename: Cheol-Hwan
authors.initials: CH
authors.lastname: Park
authors.forename: Baisong
authors.initials: B
authors.lastname: Geng
authors.forename: Caglar
authors.initials: C
authors.lastname: Girit
authors.forename: Zhao
authors.initials: Z
authors.lastname: Hao
authors.forename: Michael C
authors.initials: MC
authors.lastname: Martin
authors.forename: Alex
authors.initials: A
authors.lastname: Zettl
authors.forename: Michael F
authors.initials: MF
authors.lastname: Crommie
authors.forename: Steven G
authors.initials: SG
authors.lastname: Louie
authors.forename: Y Ron
authors.initials: YR
authors.lastname: Shen
authors.forename: Feng
authors.initials: F
authors.lastname: Wang