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

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

1997-09-11

arxiv.org/abs/cond-mat/9709130v3

JETP Letters, 67, 595 (1998)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Major changes, added one more figure, the latest version to be published in JETP Lett

Scientific paper

10.1134/1.567732

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 $\nu=1$ and $\nu=2$, 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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