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Magnetic-Field-Induced Hybridization of Electron Subbands in a Coupled Double Quantum Well

V. T. Dolgopolov·G. E. Tsydynzhapov·A. A. Shashkin·E. V. Deviatov·F. Hastreiter·M. Hartung·A. Wixforth·K. L. Campman·A. C. Gossard
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Abstract

We employ a magnetocapacitance technique to study the spectrum of the soft two-subband (or double-layer) electron system in a parabolic quantum well with a narrow tunnel barrier in the centre. In this system unbalanced by gate depletion, at temperatures $T\agt 30$ mK we observe two sets of quantum oscillations: one originates from the upper electron subband in the closer-to-the-gate part of the well and the other indicates the existence of common gaps in the spectrum at integer fillings. For the lowest filling factors $ν=1$ and $ν=2$, both the common gap presence down to the point of one- to two-subband transition and their non-trivial magnetic field dependences point to magnetic-field-induced hybridization of electron subbands.

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V. T. Dolgopolov, G. E. Tsydynzhapov, A. A. Shashkin, E. V. Deviatov, F. Hastreiter, M. Hartung, A. Wixforth, K. L. Campman, A. C. Gossard. 1998-04-06. Magnetic-Field-Induced Hybridization of Electron Subbands in a Coupled Double Quantum Well. https://doi.org/10.1134/1.567732

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