1. Ballistic transport in semiconductor nanostructures: From quasi-classical oscillations to novel THz-emitters
- Author
-
Markus Betz, Arthur C. Gossard, Hartmut G. Roskos, Torsten Loeffler, Karl Unterrainer, D. C. Driscoll, Alfred Leitenstorfer, A. Schwanhaeusser, M. Eckardt, Thomas Mueller, S. Trumm, F. Renner, F. Sotier, G. H. Doehler, Micah Hanson, G. Loata, and Stefan Malzer
- Subjects
Physics ,Nanostructure ,Condensed matter physics ,Terahertz radiation ,Ballistic conduction ,Physics::Optics ,General Physics and Astronomy ,Semiconductor nanostructures ,Electron ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect - Abstract
By suitable design it is possible to achieve quasi-ballistic transport in semiconductor nanostructures over times up to the ps-range. Monte-Carlo simulations reveal that under these conditions phase-coherent real-space oscillations of an electron ensemble, generated by fs-pulses become possible in wide potential wells. Using a two-color pump-and-probe technique we have been able to observe this new phenomenon in excellent agreement with the theoretical predictions. Apart from its fundamental significance, ballistic transport in nanostructures can also be used for high-efficiency coherent THz-sources. The concept of these THz-emitters and its experimental confirmation will also be presented.
- Published
- 2006