Excitonic absorption spectra and Sommerfeld factors of one-dimensional systems

Tetsuo Ogawa; Toshihide Takagahara

doi:10.1016/0039-6028(92)90398-P

Excitonic absorption spectra and Sommerfeld factors of one-dimensional systems

Tetsuo Ogawa, Toshihide Takagahara

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	506-511
Number of pages	6
Journal	Surface Science
Volume	263
Issue number	1-3
DOIs	https://doi.org/10.1016/0039-6028(92)90398-P
Publication status	Published - 1992 Feb 19
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/0039-6028(92)90398-P

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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.",

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AU - Ogawa, Tetsuo

AU - Takagahara, Toshihide

PY - 1992/2/19

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N2 - 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.

AB - 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.

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JO - Surface Science

JF - Surface Science

IS - 1-3

ER -

Excitonic absorption spectra and Sommerfeld factors of one-dimensional systems

Abstract

ASJC Scopus subject areas

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