Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
Nat Nanotechnol. 2010 Jan;5(1):32-6. doi: 10.1038/nnano.2009.334. Epub 2009 Nov 15.
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.
费诺共振是吸收、散射或输运谱中由于离散态和连续态相互作用而产生的特征。它们在各种系统中都有观察到。在这里，我们报告了一个在双层石墨烯中存在的多体费诺共振，它可以通过电门控连续可调。离散声子和连续激子（电子-空穴对）跃迁通过电子-声子相互作用耦合，产生一个新的杂化声子-激子激发态。也有可能用光场来控制声子-激子的耦合。这个可调谐的声子-激子系统可以为声子激光器等新型应用提供可能。
