Coulomb-modulated gain spectra in current-injection T-shaped quantum-wire lasers

Makoto Okano, Masahiro Yoshita, Hidefumi Akiyama, Ping Huai, Tetsuo Ogawa, Loren N. Pfeiffer, Ken W. West

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We measured gain spectra of highly uniform current-injection T-shaped quantum wire lasers and investigated the physics of gain-spectral-shape modulation due to strong Coulomb interactions by comparing current-injection and optical-pumping measurements and additional calculations including screened Coulomb interaction. We found remarkable features for current injection: redshifts and long high- and low-energy tails of the gain peak. These characteristic current-injection features were ascribed to band-gap renormalization, state-filling, and carrier-carrier scattering inherent to charge-imbalanced electron-hole systems (

Original languageEnglish (US)
Pages (from-to)20-23
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Issue number1
StatePublished - Jan 2011

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


  • Charge imbalance
  • Optical gain
  • Quantum wire
  • Semiconductor laser


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