Measurement of the Frequency-Dependent Conductivity in Sapphire

Jie Shan, Feng Wang, Ernst Knoesel, Mischa Bonn, Tony F. Heinz

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Electron transport of photoexcited single-crystal sapphire ([Formula presented]) is characterized by terahertz time-domain spectroscopy. The complex conductivity displays a Drude-type frequency dependence, which yields carrier scattering rates and densities. Carrier scattering is dominated by interactions with acoustical and optical phonons at low and high temperatures, respectively, and follows Matthiessen’s law over the measured temperature range of 40–350 K. The results, including low-temperature mobilities [Formula presented], are compatible with a large-polaron description of the conduction electrons.

Original languageEnglish (US)
Pages (from-to)4
Number of pages1
JournalPhysical review letters
Issue number24
StatePublished - 2003

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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