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 systems1,2,3,4,5,6. 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.
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Acknowledgements
This work was supported by the University of California at Berkeley and the Office of Basic Energy Sciences, US Department of Energy under contract no. DE-AC03-76SF0098 (Materials Science Division) and contract no. DE-AC02-05CH11231 (Advanced Light Source). Y.Z. and F.W. acknowledge support from a Miller Fellowship and a Sloan Fellowship, respectively. T.T.T. is partially supported by the National Science Council, Taiwan.
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F.W. designed the experiment. T.T.T, Y.Z., B.G. and C.G. fabricated the sample. T.T.T., Y.Z., Z.H., M.C.M. and F.W. performed infrared spectroscopy measurements. C.H.P., S.G.L and F.W. carried out the calculations. T.T.T., Y.Z., C.H.P, A.Z., M.F.C., S.G.L, Y.R.S. and F.W. co-wrote the paper.
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Tang, TT., Zhang, Y., Park, CH. et al. A tunable phonon–exciton Fano system in bilayer graphene. Nature Nanotech 5, 32–36 (2010). https://doi.org/10.1038/nnano.2009.334
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DOI: https://doi.org/10.1038/nnano.2009.334
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