The Mott transition of excitons in coupled quantum wells

  • Stern M
  • Garmider V
  • Umansky V
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Abstract

In this work we study the phase diagram of indirect excitons in coupled quantumwells , and show that the system undergoes a phase transition to unbound electron-hole plasma. This transition is manifested as an abrupt change in the photoluminescence linewidth and peak energy at some critical power density and temperature. By measuring the exciton diamagnetism, we show that the transition is associated with an abrupt increase in exciton radius. We find that the transition is stimulated by the presence of direct excitons in one of the wells, and show that they serve as a catalyst of the transition. PACS numbers: 71.35.Lk, 78

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Authors

  • M Stern

  • V Garmider

  • V Umansky

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