Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 27: Symposium New phenomena in edge transport of QHE systems
HL 27.4: Fachvortrag
Mittwoch, 29. März 2006, 16:00–16:30, HSZ 01
Selective edge excitations - inter-edge magnetoplasmon mode and inter-edge spin diode — •Frank Hohls1,2, Gennadiy Sukhodub2, and Rolf J. Haug2 — 1Cavendish Laboratory, University of Cambridge, UK — 2Abteilung Nanostrukturen, Institut für Festkörperphysik, Universität Hannover
The selective excitation and detection of quantum Hall edge states has opened access to several interesting phenomenons, two of which I will review in this talk: Firstly I will present time-resolved current measurements of edge magnetoplasmons. At filling factors close to ν=3 we observe two decoupled modes of edge excitations, one of which is related to the innermost compressible strip and is identified as an inter-edge magnetoplasmon mode [1]. From the analysis of the propagation velocities of each mode the internal spatial parameters of the edge structure are derived. Secondly we have studied the tunnelling between spin polarised edge states at high magnetic fields up to 28 T. Measurements of the inter-edge I-V characteristic in tilted magnetic fields B allow to determine the effective g-factor g∗(B) [2]. We also observe a dynamical nuclear spin polarization.
[1] G. Sukhodub, F. Hohls, and R. J. Haug, PRL 93, 196801 (2004).
[2] G. Sukhodub et al., Int. J. Mod. Phys. B 18, 3649 (2004).