Hybridization of electron subbands in a double quantum well at quantizing magnetic field

Details Hybridization of electron subbands in a double quantum well at quantizing magnetic field Hybridization of electron subbands in a double quantum well at quantizing magnetic field

1998-06-17

arxiv.org/abs/cond-mat/9806203v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

REVTeX, 24 pages, 9 figures included. Submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.59.13235

We employ magnetocapacitance and far-infrared spectroscopy techniques to study the spectrum of the double-layer electron system in a parabolic quantum well with a narrow tunnel barrier in the centre. For gate-bias-controlled asymmetric electron density distributions in this soft two-subband system we observe both individual subband gaps and double layer gaps at integer filling factor $\nu$. The bilayer gaps are shown to be either trivial common for two subbands or caused by hybridization of electron subbands in magnetic field. We describe the observed hybrid gaps at $\nu=1$ and $\nu=2$ within a simple model for the modified bilayer spectrum.

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