Two-dimensional electron gas in double quantum wells with tilted bands |
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Authors: | V B Timofeev A V Larionov P S Dorozhkin M Bayer A Forchel J Straka |
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Institution: | 1. Institute of Solid-State Physics, Russian Academy of Sciences, 142432, Chernogolovka, Russia 2. Technische Physik, Am Hubland, Universit?t Würzburg, D-97074, Würzburg, Germany
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Abstract: | When a voltage is applied to double quantum wells based on AlGaAs/GaAs heterostructures with contact regions (n-i-n structures), a two-dimensional (2D) electron gas appears in one of the quantum wells. Under illumination which generates
electron-hole pairs, the photoexcited holes become localized in a neighboring quantum well and recombine radiatively with
the 2D electrons (tunneling recombination through the barrier). The appearance, ground-state energy, and density of the degenerate
2D electron gas are determined from the structure of the Landau levels in the luminescence and luminescence excitation spectra
as well as from the oscillations of the radiative recombination intensity in a magnetic field with detection directly at the
Fermi level. The electron density is regulated by the voltage between the contact regions and increases with the slope of
the bands. For a fixed slope of the bands the 2D-electron density has an upper limit determined by the resonance tunneling
of electrons into a neighboring quantum well and subsequent direct recombination with photoexcited holes.
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 11, 840–845 (10 June 1997) |
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