A pump and probe study of photoinduced internal field screening dynamics in an AlGaN/GaN single-quantum-well structure

A. Shikanai, T. Deguchi, T. Sota, T. Kuroda, A. Tackeuchi, S. Chichibu, S. Nakamura

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Photogenerated carrier dynamics in an AlGaN/GaN single quantum well has been studied using a conventional degenerate pump and probe technique at room temperature. Photoinduced absorption at the exciton resonance has been observed. It is explained by the absorption coefficient change, through the quantum-confined Stark effect and the quantum-confined Franz-Keldish effect, caused by the photoinduced internal electric-field screening. In comparison with biased GaAs multiple quantum wells, a slower time evolution of differential transmission signals has been also found. Its origin is attributed to the longer carrier sweep-out time due to the potential profile of the sample in conjunction with the longer carrier recombination time.

Original languageEnglish
Pages (from-to)454-456
Number of pages3
JournalApplied Physics Letters
Volume76
Issue number4
DOIs
Publication statusPublished - 2000 Jan 24

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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