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, Cun-Zheng Ning

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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
Volume40
Issue number5
DOIs
StatePublished - Mar 2008

Fingerprint

Optical gain
Semiconductor quantum wires
quantum wires
Excitons
crossovers
excitons
Plasmas
Electrons
Lasers
lasers
thresholds
population inversion
Electron transitions
LDS 751
shift

Keywords

  • Biexciton
  • Mott transition
  • Quantum wire
  • Semiconductor laser

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Exciton-biexciton-plasma crossover and formation of optical gain in quantum wires. / Akiyama, Hidefumi; Yoshita, Masahiro; Hayamizu, Yuhei; Liu, Shu man; Okano, Makoto; Pfeiffer, Loren N.; West, Ken W.; Huai, Ping; Asano, Kenichi; Ogawa, Tetsuo; Ning, Cun-Zheng.

In: Physica E: Low-Dimensional Systems and Nanostructures, Vol. 40, No. 5, 03.2008, p. 1726-1728.

Research output: Contribution to journalArticle

Akiyama, H, Yoshita, M, Hayamizu, Y, Liu, SM, Okano, M, Pfeiffer, LN, West, KW, Huai, P, Asano, K, Ogawa, T & Ning, C-Z 2008, 'Exciton-biexciton-plasma crossover and formation of optical gain in quantum wires', Physica E: Low-Dimensional Systems and Nanostructures, vol. 40, no. 5, pp. 1726-1728. https://doi.org/10.1016/j.physe.2007.10.067
Akiyama, Hidefumi ; Yoshita, Masahiro ; Hayamizu, Yuhei ; Liu, Shu man ; Okano, Makoto ; Pfeiffer, Loren N. ; West, Ken W. ; Huai, Ping ; Asano, Kenichi ; Ogawa, Tetsuo ; Ning, Cun-Zheng. / Exciton-biexciton-plasma crossover and formation of optical gain in quantum wires. In: Physica E: Low-Dimensional Systems and Nanostructures. 2008 ; Vol. 40, No. 5. pp. 1726-1728.
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AU - Okano, Makoto

AU - Pfeiffer, Loren N.

AU - West, Ken W.

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AB - 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.

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