Keilmann, Fritz Laboratory for Attosecond Physics, Max Planck Institute of Quantum Optics, Max Planck Society;
Fei, Z., Rodin, A. S., Andreev, G. O., Bao, W., McLeod, A. S., Wagner, M., et al. (2012). Gate-tuning of graphene plasmons revealed by infrared nano-imaging. Nature, 487(7405), 82-85. doi:10.1038/nature11253.