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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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