SKM 2021 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 3: Poster Session I
HL 3.8: Poster
Montag, 27. September 2021, 10:00–13:00, P
Magnetotunneling Spectroscopy of Double Quantum Wells in GaAs/AlGaAs Heterostructures — •Maximilian Mischke1, Gunnar Schneider1, Werner Dietsche2, and Rolf Johann Haug1 — 1Leibniz Universität Hannover, Institut für Festkörperphysik — 2Max-Planck-Institut für Festkörperfoschung, Stuttgart
In order to investigate the influence of a parallel magnetic field on bilayer phenomena, we performed magnetotunneling measurements on GaAs/AlGaAs double quantum wells. Therefore, the tunneling current between the two quantum wells is measured dependent on applied bias voltage, electron densities in the individual wells and a magnetic field oriented parallel to the 2D layers. We observe a systematic dependence of the tunneling resonance on the energetic difference of the two wells due to imbalanced densities. The applied bias compensates the mismatch. The parallel magnetic field introduces an additional term to the wave vector of the electrons, leading to a shift of the Fermi circles of the two quantum wells against each other [1]. This shift has an influence on the tunneling resonance since 2D-2D-tunneling requires not only energy conservation but also conservation of momentum [2]. The results of the measurements allow for a mapping of the Fermi contours of the two quantum wells [3,4].
[1] G.S. Boebinger et al, Phys. Rev. B 43, 12673 (1991)
[2] J.P. Eisenstein et al, Appl. Phys. Lett. 58, 1497 (1991)
[3] J.P. Eisenstein et al, Phys. Rev. B 44, 6511 (1991)
[4] T. Ihn et al, Phys. Rev. B 54, R2315 (1996)