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Keywords = non-Drude transport

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12 pages, 632 KiB  
Article
Localization Phenomena in Disordered Tantalum Films
by Natalia Kovaleva, Dagmar Chvostova and Alexandr Dejneka
Metals 2017, 7(7), 257; https://doi.org/10.3390/met7070257 - 7 Jul 2017
Cited by 8 | Viewed by 5954
Abstract
Using dc transport and wide-band spectroscopic ellipsometry techniques we study localization phenomena in highly disordered metallic β -Ta films grown by rf sputtering deposition. The dc transport study implies non-metallic behavior (d ρ /dT < 0), with negative temperature coefficient of resistivity [...] Read more.
Using dc transport and wide-band spectroscopic ellipsometry techniques we study localization phenomena in highly disordered metallic β -Ta films grown by rf sputtering deposition. The dc transport study implies non-metallic behavior (d ρ /dT < 0), with negative temperature coefficient of resistivity (TCR). We found that as the absolute TCR value increased, specifying an elevated degree of disorder, the free charge carrier Drude response decreases, indicating the enhanced charge carrier localization. Moreover, we found that the pronounced changes occur at the extended spectral range, involving not only the Drude resonance, but also the higher-energy Lorentz bands, in evidence of the attendant electronic correlations. We propose that the charge carrier localization, or delocalization, is accompanied by the pronounced electronic band structure reconstruction due to many-body effects, which may be the key feature for understanding the physics of highly disordered metals. Full article
(This article belongs to the Special Issue Bulk Metallic Glasses)
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10 pages, 1820 KiB  
Review
Dynamics of Carrier Transport in Nanoscale Materials: Origin of Non-Drude Behavior in the Terahertz Frequency Range
by Koichi Shimakawa and Safa Kasap
Appl. Sci. 2016, 6(2), 50; https://doi.org/10.3390/app6020050 - 14 Feb 2016
Cited by 13 | Viewed by 8749
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Frontiers in Terahertz Science and Technology)
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