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APS » Journals » Phys. Rev. Lett. » Volume 90 » Issue 24
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Phys. Rev. Lett. 90, 247401 (2003) [4 pages]

Measurement of the Frequency-Dependent Conductivity in Sapphire

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Jie Shan1,*, Feng Wang1, Ernst Knoesel1,†, Mischa Bonn2, and Tony F. Heinz1
1Departments of Physics and Electrical Engineering, Columbia University, 538 West 120th Street, New York, New York 10027, USA
2Leiden Institute of Chemistry, P.O. Box 9502, 2300 Leiden, The Netherlands

Received 5 March 2003; published 17 June 2003

Electron transport of photoexcited single-crystal sapphire (α-Al2O3) 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 >10 000  cm2/V s, are compatible with a large-polaron description of the conduction electrons.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.247401
DOI:
10.1103/PhysRevLett.90.247401
PACS:
78.47.+p, 71.38.–k, 72.10.–d, 72.80.–r

*Current address: Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106, USA.

†Current address: Department of Physics and Astronomy, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, USA.

 
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