Phase diagram of a two-dimensional liquid in GaAs/AlxGa1xAs biased double quantum wells

V. B. Timofeev, A. V. Larionov, M. Grassi-Alessi, M. Capizzi, and J. M. Hvam
Phys. Rev. B 61, 8420 – Published 15 March 2000
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Abstract

Photoluminescence (PL) and PL excitation (PLE) measurements have been performed in GaAs/AlxGa1xAs biased double quantum well heterostructures. The recombination of electrons, e, with holes, h, located in the same or in two adjacent wells, has been investigated for different exciting power densities, P, and temperatures, T. For increasing P or decreasing T, a sharp transition from two gases of photoexcited electrons and holes, spatially separated and confined in the two wells, to two two-dimensional (2D) liquids has been observed. The gas-to-2D-liquid transition is evidenced by a strong screening of applied biases and by major changes in the optical spectra. The phase diagram in the (P,T) plane of the eh system has been determined. Time-resolved PL, cw PL, and PLE in the presence of a magnetic field normal to the quantum wells support the presence of e- and h-liquid phases in the two wells with a critical density equal to 8.8×1010cm2 and a binding energy of 2.5 meV.

  • Received 22 September 1999

DOI:https://doi.org/10.1103/PhysRevB.61.8420

©2000 American Physical Society

Authors & Affiliations

V. B. Timofeev and A. V. Larionov

  • Institute of Solid State Physics, Russian Academy of Science, 142432 Chernogolovka, Russia

M. Grassi-Alessi and M. Capizzi

  • Istituto Nazionale di Fisica della Materia, Dipartimento di Fisica, Università degli Studi di Roma (La Sapienza), 00185 Roma, Italy

J. M. Hvam

  • Research Center COM, The Technical University of Denmark, DK 2800 Lyngby, Denmark

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Vol. 61, Iss. 12 — 15 March 2000

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