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Data for Weak localization and weak antilocalization in doped germanium epilayers
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Myronov, Maksym, Newton, Peter, Mansell, R. and Holmes, S. N. (2017) Data for Weak localization and weak antilocalization in doped germanium epilayers. [Dataset]
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Official URL: https://doi.org/10.17863/CAM.7415
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: | Dataset | ||||||
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| Subjects: | Q Science > QC Physics | ||||||
| Divisions: | Faculty of Science > Physics | ||||||
| Type of Data: | Experimental data | ||||||
| Library of Congress Subject Headings (LCSH): | Germanium crystals -- Electric properties, Spintronics | ||||||
| Publisher: | University of Cambridge | ||||||
| Official Date: | 1 January 2017 | ||||||
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| Status: | Not Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Media of Output: | .txt | ||||||
| Access rights to Published version: | Open Access | ||||||
| Copyright Holders: | University of Warwick | ||||||
| Description: | Data record consists of 26 raw data files in plain text format and a metadata text file. |
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