Skip to main content
Log in

Screening of excitonic states by low-density 2D charge carriers in GaAs/AlGaAs quantum wells

  • Condensed Matter
  • Published:
Journal of Experimental and Theoretical Physics Letters Aims and scope Submit manuscript


Screening of excitonic states by a system of 2D electrons (or holes) in GaAs/AlGaAs single quantum wells is studied. With increasing concentration of 2D charge carriers, a threshold-type disappearance of excitonic states is observed in both luminescence and reflectance spectra. The higher the quality of the 2D system, the lower the corresponding threshold concentration. In the best systems, the collapse of excitonic states occurs at unexpectedly low electron densities n e =5×109 cm−2, which correspond to the mean dimensionless distance between the particles r s =8. This value far exceeds the threshold values observed for 3D systems (r s ≈2), as well as the values obtained for quantum wells in previous studies. The problem of measuring the concentration of low-density 2D charge carriers in photoexcitation conditions is solved by applying the method of optical detection of the dimensional magnetoplasma resonance. This method provides reliable measurements of the density of a 2D system to the values about 109 cm−2.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others


  1. T. Rice, J. Hensel, T. Phillips, and G. Tomas, Solid State Phys. 32, 1 (1977); The Electron Hole Liquid in Semiconductors: Theoretical Aspects. Experimental Aspects (Mir, Moscow, 1980), p. 127.

    Google Scholar 

  2. I. V. Kukushkin et al., Zh. Éksp. Teor. Fiz. 84, 1145 (1983) [Sov. Phys. JETP 57, 665 (1983)].

    Google Scholar 

  3. V. E. Bisti and A. P. Silin, Fiz. Tverd. Tela (Leningrad) 20, 1850 (1978) [Sov. Phys. Solid State 20, 1068 (1978)].

    Google Scholar 

  4. T. Ando et al., Rev. Mod. Phys. 54, 437 (1982).

    Article  ADS  Google Scholar 

  5. G. E. W. Bauer, Phys. Rev. B 45, 9153 (1992).

    Article  ADS  Google Scholar 

  6. G. Finkelstein, H. Strikman, and I. Bar-Josef, Phys. Rev. Lett. 74, 976 (1995).

    Article  ADS  Google Scholar 

  7. V. Huard et al., Phys. Rev. Lett. 84, 187 (2000).

    Article  ADS  Google Scholar 

  8. W. Ossau et al., Physica B (Amsterdam) 256–258, 323 (1998).

    Google Scholar 

  9. O. V. Volkov, S. V. Tovstonog, I. V. Kukushkin, et al., Pis’ma Zh. Éksp. Teor. Fiz. 70, 588 (1999) [JETP Lett. 70, 595 (1999)].

    Google Scholar 

  10. I. Kukushkin and V. B. Timofeev, Adv. Phys. 45, 147 (1996).

    Article  ADS  Google Scholar 

  11. B. A. Allen, Jr., H. L. Stormer, and J. C. M. Hwang, Phys. Rev. B 28, 4875 (1983).

    ADS  Google Scholar 

  12. B. M. Ashkinadze et al., Phys. Rev. Lett. 83, 812 (1999).

    ADS  Google Scholar 

Download references

Author information

Authors and Affiliations


Additional information


Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 72, No. 6, 2000, pp. 469–474.

Original Russian Text Copyright © 2000 by Gubarev, Kukushkin, Tovstonog, Akimov, Smet, von Klitzing, Wegscheider.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Gubarev, S.I., Kukushkin, I.V., Tovstonog, S.V. et al. Screening of excitonic states by low-density 2D charge carriers in GaAs/AlGaAs quantum wells. Jetp Lett. 72, 324–328 (2000).

Download citation

  • Received:

  • Issue Date:

  • DOI:

PACS numbers