Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-07-02
Nature Nanotechnology 5, 32-36 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
21 pages, 3 figures
Scientific paper
10.1038/nnano.2009.334
Interference between different possible paths lies at the heart of quantum physics. Such interference between coupled discrete and continuum states of a system can profoundly change its interaction with light as seen in Fano resonance. Here we present a unique many-body Fano system composed of a discrete phonon vibration and continuous electron-hole pair transitions in bilayer graphene. Mediated by the electron-phonon interactions, the excited state is described by new quanta of elementary excitations of hybrid phonon-exciton nature. Infrared absorption of the hybrid states exhibit characteristic Fano lineshapes with parameters renormalized by many-body interactions. Remarkably, the Fano resonance in bilayer graphene is continuously tunable through electrical gating. Further control of the phonon-exciton coupling may be achieved with an optical field exploiting the excited state infrared activity. This tunable phonon-exciton system also offers the intriguing possibility of a 'phonon laser' with stimulated phonon amplification generated by population inversion of band-edge electrons.
Crommie Michael F.
Geng Baisong
Girit Caglar
Hao Zhao
Louie Steven G.
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