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.
本文言語 | English |
---|---|
ページ(範囲) | 14325-14328 |
ページ数 | 4 |
ジャーナル | Physical Review B |
巻 | 43 |
号 | 17 |
DOI | |
出版ステータス | Published - 1991 1月 1 |
外部発表 | はい |
ASJC Scopus subject areas
- 凝縮系物理学