Regensburg 2004 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HL: Halbleiterphysik

HL 22: Transport im hohen Magnetfeld/Quanten-Hall-Effekt

HL 22.10: Vortrag

Dienstag, 9. März 2004, 17:30–17:45, H14

Equilibration between spin split edge channels studied by time-resolved measurements — •Gennadiy Sukhodub, Frank Hohls, and Rolf Haug — Institut für Festkörper Physik, Universität Hannover, Appelstraße 2, D-30167 Hannover, Germany

The concept of edge channels (EC) utilizes a two-dimensional electron system in the regime of integer quantum Hall effect as an object for study of the interactions between one-dimensional (1D) channels. Particularly, the scattering between these 1D states can be investigated in a sample which allows for selective population of different EC. In our system a short voltage pulse is applied to one of the two EC at filling factor ν=2. After interaction over a distance of 20µm with a not excited state these two EC are separated and a time-resolved current in each channel is detected independently. Selective population and detection is realized by well-established cross gates technique. Dependent on the polarity of the applied pulse two scattering regimes with significantly different equilibration lengths are possible. We studied the influence of the pulse amplitude on the equilibration in the case of weak scattering. We obtain characteristic time scales for the adiabatic and the equilibrated regime of the current transport. There is a strong indication of the involvement of the higher Landau levels in the scattering between EC at higher voltage biases.