Koichi Shimakawa 1,* ,† and Safa Kasap 2,†
1 Joint Laboratory of Solid State Chemistry, University of Pardubice, Pardubice 530 02, Czech Republic
2 Department of Electrical Engineering, University of Saskatchewan, Saskatoon, SK S7N 5A9, Canada; safa.kasap@usak.ca
* Correspondence: koichi@gifu-u.ac.jp; Tel./Fax: +81-58-241-2185
† The authors contributed equally to this work.
Academic Editor: Takayoshi Kobayashi Received: 18 November 2015; Accepted: 27 January 2016; Published: 14 February 2016
www.mdpi.com/2076-3417/6/2/50/pdf
Abstract: It is known that deviation from the Drude law for free carriers is dramatic in most electronically conductive nanomaterials. We review recent studies of the conductivity of nanoscale materials at terahertz (THz) frequencies. We suggest that among a variety of theoretical formalisms, a model of series sequence of transport involving grains and grain boundaries provides a reasonable explanation of Lorentz-type resonance (non-Drude behavior) in nanomaterials. Of particular interest is why do free carriers exhibit a Lorentz-type resonance.
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