Interband absorption spectra and Sommerfeld factors of a one-dimensional electron-hole system

Tetsuo Ogawa, Toshihide Takagahara

研究成果: Article

153 引用 (Scopus)

抄録

Optical absorption spectra are exactly calculated for direct interband transitions in a one-dimensional (1D) electron-hole system within the effective-mass approximation. We employ a modified Coulomb potential between an electron and a hole to avoid the well-known divergence problem in the 1D system. The Sommerfeld factor, which is the absorption intensity ratio of the unbound exciton to the free electron-hole pair above the band edge, is found for the first time to be less than unity for the direct allowed transition in striking contrast to the three- and two-dimensional cases. This feature can be understood in terms of anomalously strong concentration of oscillator strength on the lowest 1D exciton state.

元の言語English
ページ(範囲)14325-14328
ページ数4
ジャーナルPhysical Review B
43
発行部数17
DOI
出版物ステータスPublished - 1991
外部発表Yes

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Absorption spectra
absorption spectra
Excitons
Electrons
excitons
Electron transitions
Light absorption
Coulomb potential
oscillator strengths
free electrons
optical spectrum
unity
divergence
optical absorption
approximation
LDS 751

ASJC Scopus subject areas

  • Condensed Matter Physics

これを引用

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AB - Optical absorption spectra are exactly calculated for direct interband transitions in a one-dimensional (1D) electron-hole system within the effective-mass approximation. We employ a modified Coulomb potential between an electron and a hole to avoid the well-known divergence problem in the 1D system. The Sommerfeld factor, which is the absorption intensity ratio of the unbound exciton to the free electron-hole pair above the band edge, is found for the first time to be less than unity for the direct allowed transition in striking contrast to the three- and two-dimensional cases. This feature can be understood in terms of anomalously strong concentration of oscillator strength on the lowest 1D exciton state.

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