Excitonic absorption spectra and Sommerfeld factors of one-dimensional systems

Tetsuo Ogawa, Toshihide Takagahara

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We investigate theoretically optical absorption spectra near a hand edge for one-dimensional (1D) semiconductors with a direct band gap. taking 1D Wannier-type exciton effects into account. The Sommerfeld factor, which is the absorption intensity ratio of the continuum exciton to the free electron-hole pair above the hand edge, is found to be smaller than unity for an allowed transition in striking contrast to the three- and two-dimensional cases. This peculiar feature is interpreted in terms of the anomalously strong concentration of the oscillator strength on the lowest discrete exciton state.

Original languageEnglish
Pages (from-to)506-511
Number of pages6
JournalSurface Science
Volume263
Issue number1-3
DOIs
Publication statusPublished - 1992 Feb 19
Externally publishedYes

Fingerprint

Excitons
Absorption spectra
excitons
absorption spectra
oscillator strengths
Light absorption
free electrons
optical spectrum
unity
Energy gap
optical absorption
Semiconductor materials
continuums
Electrons
LDS 751

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Excitonic absorption spectra and Sommerfeld factors of one-dimensional systems. / Ogawa, Tetsuo; Takagahara, Toshihide.

In: Surface Science, Vol. 263, No. 1-3, 19.02.1992, p. 506-511.

Research output: Contribution to journalArticle

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