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Dependence of crystal structure and work function of WNx films on the nitrogen content
The effect of nitrogen content on crystal structure (phase and grain size) and work function (m) of WNx films is investigated. The m of WNx films is extracted from the plot of flatband voltage versus ...
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Low temperature terahertz spectroscopy of n-InSb through a magnetic field driven metal-insulator transition

Appl. Phys. Lett. 89, 122108 (2006); doi:10.1063/1.2356105

Published 19 September 2006

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X. P. A. Gao, J. Y. Sohn, and S. A. Crooker
National High Magnetic Field Laboratory, Los Alamos, New Mexico 87545
The authors use fiber-coupled photoconductive emitters and detectors to perform terahertz spectroscopy of lightly doped n-InSb directly in the cryogenic (1.5  K) bore of a high-field superconducting magnet. They measure transmission spectra from 0.1  to  1.1  THz as the sample is driven through a metal-to-insulator transition (MIT) by applied magnetic field. In the low-field metallic state, the data directly reveal the plasma edge and magnetoplasmon modes. With increasing field, a surprisingly broad band (0.3–0.8  THz) of low transmission appears at the onset of the MIT. This band subsequently collapses and evolves into the sharp 1s-->2p– transition of electrons "frozen" onto isolated donors in the insulating state. ©2006 American Institute of Physics
History: Received 17 April 2006; accepted 1 August 2006; published 19 September 2006
Permalink: http://link.aip.org/link/?APPLAB/89/122108/1
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KEYWORDS and PACS

Keywords
PACS
  • 78.70.Gq
    Microwave and radio-frequency interactions with condensed matter
  • 71.30.+h
    Metal–insulator transitions and other electronic transitions
  • 72.60.+g
    Mixed conductivity and conductivity transitions
  • 72.20.My
    Galvanomagnetic and other magnetotransport effects (semiconductors/insulators)
  • 72.30.+q
    High-frequency effects; plasma effects in electronic transport
  • 71.45.Gm
    Exchange, correlation, dielectric and magnetic response functions, plasmons
  • YEAR: 2006

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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