THz collective oscillations of ballistic electrons in wide potential wells: Bridging classical transport with quantum dynamicsM. Eckardt, M. Betz, A. Schwanhäußer, S. Trumm, F. Sotier, L. Robledo, S. Malzer, T. Müller, K. Unterrainer, A. Leitenstorfer and G. H. DöhlerEurophys. Lett., 70 4 (2005) 534-540DOI: https://doi.org/10.1209/epl/i2005-10014-6