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.
Similar content being viewed by others
References
Y. J. Chen, E. S. Koteles, B. S. Elman, and C. A. Arimento, Phys. Rev. B 36, 4562 (1987).
M. N. Islam, R. L. Hillman, D. A. Miller et al., Appl. Phys. Lett. 50, 1098 (1987).
J. E. Golub, K. Kash, J. P. Harbison, and L. T. Florez, Phys. Rev. B 41, 8564 (1990).
T. Fukuzawa, E. E. Mendez, and J. M. Wang, Phys. Rev. Lett. 64, 3066 (1990).
L. V. Butov, A. Zrenner, G. Abstreiter et al., Phys. Rev. Lett. 73, 304 (1994).
Yu. E. Lozovik and V. Yudson, Zh. Éksp. Teor. Fiz. 71, 738 (1976) [Sov. Phys. JETP 44, 389 (1976)].
I. V. Lerner and Yu. E. Lozovik, Zh. Éksp. Teor. Fiz. 78, 1167 (1980) [Sov. Phys. JETP 51, 588 (1980)].
D. Yoshioka and MacDonald, J. Phys. Soc. Jpn. 59, 4211 (1990).
X. M. Chen and J. J. Quinn, Phys. Rev. Lett. 67, 895 (1991).
I. V. Kukushkin and V. B. Timofeev, Adv. Phys. 45, 147–242 (1996).
Author information
Authors and Affiliations
Additional information
Pis’ma Zh. Éksp. Teor. Fiz. 65, No. 11, 840–845 (10 June 1997)
Rights and permissions
About this article
Cite this article
Timofeev, V.B., Larionov, A.V., Dorozhkin, P.S. et al. Two-dimensional electron gas in double quantum wells with tilted bands. Jetp Lett. 65, 877–882 (1997). https://doi.org/10.1134/1.567440
Received:
Issue Date:
DOI: https://doi.org/10.1134/1.567440