Exciton-biexciton-plasma crossover and formation of optical gain in quantum wires

Hidefumi Akiyama, Masahiro Yoshita, Yuhei Hayamizu, Shu man Liu, Makoto Okano, Loren N. Pfeiffer, Ken W. West, Ping Huai, Kenichi Asano, Tetsuo Ogawa, C. Z. Ning

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


T-shaped GaAs quantum-wire lasers were measured to study origin of laser gain and the exciton Mott transition in one dimension. Origin of laser gain was ascribed not to free excitons, or localized excitons, but to biexciton-exciton population inversion near the threshold, or to the electron-hole (e-h) plasma at a high-density regime well above the threshold. Systematic micro-PL study revealed that dominant PL evolves with e-h density from a sharp free-exciton peak, via a biexciton peak, to an e-h plasma PL band. These demonstrated important roles of biexcitons in the Mott transition and in the initial formation of optical gain. Comparison with microscopic theories raised a question for arguments based on large renormalized band-edge shift before the Mott transition.

Original languageEnglish (US)
Pages (from-to)1726-1728
Number of pages3
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number5
StatePublished - Mar 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


  • Biexciton
  • Mott transition
  • Quantum wire
  • Semiconductor laser


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