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Weak localization and weak antilocalization in doped germanium epilayers
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Newton, P. J., Mansell, R., Holmes, S. N., Myronov, Maksym and Barnes, C. H. W. (2017) Weak localization and weak antilocalization in doped germanium epilayers. Applied Physics Letters, 110 (6). 062101. doi:10.1063/1.4975600 ISSN 0003-6951.
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Official URL: http://dx.doi.org/10.1063/1.4975600
Abstract
The magnetoresistance of 50 nm thick epilayers of doped germanium is measured at a range of temperatures down to 1.6 K. Both n- and p-type devices show quantum corrections to the conductivity in an applied magnetic field, with n-type devices displaying weak localization and p-type devices showing weak antilocalization. From fits to these data using the Hikami-Larkin-Nagaoka model, the phase coherence length of each device is extracted, as well as the spin diffusion length of the p-type device. We obtain phase coherence lengths as large as 325 nm in the highly doped n-type device, presenting possible applications in quantum technologies. The decay of the phase coherence length with temperature is found to obey the same power law of lϕ ∝ Tc, where c = −0.68 ± 0.03, for each device, in spite of the clear differences in the nature of the conduction. In the p-type device, the measured spin diffusion length does not change over the range of temperatures for which weak antilocalization can be observed. The presence of a spin-orbit interaction manifested as weak antilocalization in the p-type epilayer suggests that these structures could be developed for use in spintronic devices such as the spin-FET, where significant spin lifetimes would be important for efficient device operation.
Item Type: | Journal Article | ||||||||||||
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Subjects: | Q Science > QC Physics | ||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
Library of Congress Subject Headings (LCSH): | Germanium crystals -- Electric properties, Spintronics | ||||||||||||
Journal or Publication Title: | Applied Physics Letters | ||||||||||||
Publisher: | American Institute of Physics | ||||||||||||
ISSN: | 0003-6951 | ||||||||||||
Official Date: | February 2017 | ||||||||||||
Dates: |
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Volume: | 110 | ||||||||||||
Number: | 6 | ||||||||||||
Article Number: | 062101 | ||||||||||||
DOI: | 10.1063/1.4975600 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
Date of first compliant deposit: | 13 February 2017 | ||||||||||||
Date of first compliant Open Access: | 28 February 2018 | ||||||||||||
RIOXX Funder/Project Grant: |
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