M.  Wagner, McLeod, A. S., Maddox, S. J., Fei, Z., Liu, M., Averitt, R. D., Fogler, M. M., Bank, S. R., Keilmann, F., and Basov, D. N., ?Ultrafast Dynamics of Surface Plasmons in InAs by Time-Resolved Infrared Nanospectroscopy?, Nano Letters, 2014.