Low temperature terahertz spectroscopy of n-InSb through a magnetic field driven metal-insulator transition

We use fiber-coupled photoconductive emitters and detectors to perform terahertz (THz) spectroscopy of lightly-doped n-InSb directly in the cryogenic (1.5 K) bore of a high-field superconducting magnet. We measure transmission spectra from 0.1-1.1 THz as the sample is driven through a metal-insulato...

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Bibliographic Details
Published inarXiv.org
Main Authors Gao, X P A, Sohn, J Y, Crooker, S A
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 24.05.2006
Subjects
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Emitters
Emitters (electron)
Indium antimonide
Insulators
Intermetallic compounds
Magnetic fields
Magnetism
Metal-insulator transition
Spectroscopy
Spectrum analysis
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Summary:We use fiber-coupled photoconductive emitters and detectors to perform terahertz (THz) spectroscopy of lightly-doped n-InSb directly in the cryogenic (1.5 K) bore of a high-field superconducting magnet. We measure transmission spectra from 0.1-1.1 THz as the sample is driven through a metal-insulator transition (MIT) by applied magnetic field. In the low-field metallic state, the data directly reveal the plasma edge and magneto-plasmon 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.
ISSN:2331-8422
DOI:10.48550/arxiv.0605077