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

研究成果: Article査読

4 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1726-1728
ページ数3
ジャーナルPhysica E: Low-Dimensional Systems and Nanostructures
40
5
DOI
出版ステータスPublished - 2008 3月 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 原子分子物理学および光学
  • 凝縮系物理学

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