Berlin 2005 – scientific programme
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HL: Halbleiterphysik
HL 53: Transport im hohen Magnetfeld/Quanten-Hall-Effekt
HL 53.3: Talk
Tuesday, March 8, 2005, 15:30–15:45, TU P270
Spin Splitting Studied by Tunneling between Edge States — •G. Sukhodub1, R. Winkler1, F. Hohls1, R. J. Haug1, D. K. Maude2, D. Reuter3, and A. D. Wieck3 — 1Institut für Festkörper Physik, Universität Hannover, Germany — 2High Magnetic Field Laboratory, CNRS, Grenoble, France — 3Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Germany
A concept of selective population and detection of edge states (ES’s) in the quantum Hall regime attracted considerable attention in recent years. Dependent on the width of an incompressible strip separating two ES’s and on the length of the interaction region between them two different transport regimes, viz. equilibrated and adiabatic, can be realized. At filling factor three, for instance, decoupled transport in the innermost ES was recently demonstrated which allowed to identify an interedge magnetoplasmon mode [1].
At filling factor two, which is the subject of the present study, a transition from the adiabatic to the equilibrated regime was investigated as a function of the in-plane magnetic field. We found that the Zeeman energy with |g*|=0.44 mainly accounts for the observed threshold voltage. The deviation from the linear dependence on the magnetic field at higher fields is in good agreement with a self-consistent calculation of the subband structure. There are no indications of exchange interaction considerably affecting the measured energy gaps at the edge of a two-dimensional system.
[1] G. Sukhodub, F. Hohls, and R. J. Haug, Phys. Rev. Lett. 93, 196801 (2004)