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Pis'ma v Zh. Èksper. Teoret. Fiz., 2002, Volume 76, Issue 7, Pages 526–531 (Mi jetpl2946)  

This article is cited in 9 scientific papers (total in 9 papers)


Phase diagram of the Bose condensation of interwell excitons in GaAs/AlGaAs double quantum wells

A. A. Dremina, V. B. Timofeeva, A. V. Larionova, J. Hvamb, K. Soerensenb

a Institute of Solid State Physics, Russian Academy of Sciences
b Microelectronic Centre, Technical University of Denmark, Lyngby

Abstract: The luminescence of interwell excitons in GaAs/AlGaAs double quantum wells ($n{-}i{-}n$ heterostructures) with large-scale fluctuations of random potential in the heteroboundary planes was studied at low temperatures down to 0.5 K. The properties of excitons whose photoexcited electron and hole are spatially separated in the neighboring quantum wells by a tunneling barrier were studied as functions of density and temperature. The studies were performed within domains about one micron in size, which played the role of macroscopic traps for interwell excitons. For this purpose, the sample surface was coated with a metal mask containing special openings (windows) of a micron size or smaller. Both photoexcitation and observation of luminescence were performed through these windows by the fiber optic technique. At low pumping powers, the interwell excitons were strongly localized because of the residual charged impurities, and the corresponding photoluminescence line was nonuniformly broadened. As the laser excitation power increased, a narrow line due to delocalized excitons arose in a threshold-like manner, after which its intensity rapidly increased with growing pumping and the line itself narrowed (to a linewidth less than 1 meV) and shifted toward lower energies (by about 0.5 meV) in accordance with the filling of the lowest exciton state in the domain. An increase in temperature was accompanied by the disappearance of the line from the spectrum in a nonactivation manner. The phenomenon observed in the experiment was attributed to Bose-Einstein condensation in a quasi-two-dimensional system of interwell excitons. In the temperature interval studied (0.5-3.6) K, the critical exciton density and temperature were determined and a phase diagram outlining the exciton condensate region was constructed.

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English version:
Journal of Experimental and Theoretical Physics Letters, 2002, 76:7, 450–455

Document Type: Article
PACS: 73.20.Mf, 73.21.Fg
Received: 28.08.2002

Citation: A. A. Dremin, V. B. Timofeev, A. V. Larionov, J. Hvam, K. Soerensen, “Phase diagram of the Bose condensation of interwell excitons in GaAs/AlGaAs double quantum wells”, Pis'ma v Zh. Èksper. Teoret. Fiz., 76:7 (2002), 526–531; JETP Letters, 76:7 (2002), 450–455

Citation in format AMSBIB
\by A.~A.~Dremin, V.~B.~Timofeev, A.~V.~Larionov, J.~Hvam, K.~Soerensen
\paper Phase diagram of the Bose condensation of interwell excitons in GaAs/AlGaAs double quantum wells
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
\yr 2002
\vol 76
\issue 7
\pages 526--531
\jour JETP Letters
\yr 2002
\vol 76
\issue 7
\pages 450--455

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    This publication is cited in the following articles:
    1. V. B. Timofeev, “Electron correlation phenomena in semiconductor low-dimension structures and nanostructures”, Phys. Usp., 47:10 (2004), 1037–1044  mathnet  crossref  crossref  adsnasa  isi
    2. V. B. Timofeev, “Collective exciton effects in spatially separated electron–hole layers in semiconductors”, Phys. Usp., 48:3 (2005), 295–306  mathnet  crossref  crossref  adsnasa  isi
    3. JETP Letters, 82:1 (2005), 39–43  mathnet  crossref  isi
    4. A. V. Gorbunov, V. B. Timofeev, “Bose condensation of interwell excitons and spatial structure of luminescence in lateral traps”, Phys. Usp., 49:6 (2006), 629–634  mathnet  crossref  crossref  adsnasa  isi
    5. JETP Letters, 84:6 (2006), 329–334  mathnet  crossref  isi
    6. JETP Letters, 90:2 (2009), 146–151  mathnet  crossref  isi
    7. A. V. Gorbunov, V. B. Timofeev, “Phase diagram of the bose condensation of dipolar excitons in GaAs/AlGaAs quantum-well heterostructures”, JETP Letters, 96:2 (2012), 138–147  mathnet  crossref  isi  elib  elib
    8. Kirsanske G., Tighineanu P., Daveau R.S., Miguel-Sanchez J., Lodahl P., Stobbe S., “Observation of the exciton Mott transition in the photoluminescence of coupled quantum wells”, Phys. Rev. B, 94:15 (2016), 155438  crossref  isi  elib  scopus
    9. Lozovik Yu.E., Kurbakov I.L., Volkov P.A., “Anisotropic Superfluidity of Two-Dimensional Excitons in a Periodic Potential”, Phys. Rev. B, 95:24 (2017), 245430  crossref  isi  scopus
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