Band mobility of photoexcited electrons in Bi12SiO 20

Ivan Biaggio*, Robert W. Hellwarth, Jouni P. Partanen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

46 Citations (Scopus)

Abstract

We determine the band mobility of photoexcited electrons in cubic n-type Bi 12SiO 20. We measure a room-temperature mobility of 3.4 ± 0.5 cm 2/(Vs) that decreases monotonically to 1.7 ± 0.3 cm 2/(Vs) as the temperature is increased to 200 °C. We show that electrons in Bi 12SiO 20 form large polarons. Our results are predicted by strong coupling polaron theory if the band mass of the electrons is chosen to be 2.0 ± 0.1 electron masses. We determine the electron-phonon coupling constant and effective longitudinal optical phonon frequency required for this prediction from the available infrared reflectivity spectrum of Bi 12SiO 20.

Original languageEnglish
Pages (from-to)891-894
Number of pages4
JournalPhysical Review Letters
Volume78
Issue number5
DOIs
Publication statusPublished - 3 Feb 1997
MoE publication typeA1 Journal article-refereed

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