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Magnetotransport in p-type Ge quantum well narrow wire arrays
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Newton, P. J., Llandro, J., Mansell, R., Holmes, S. N., Morrison, Christopher, Foronda, Jamie, Myronov, Maksym, Leadley, D. R. (David R.) and Barnes, C. H. W. (2015) Magnetotransport in p-type Ge quantum well narrow wire arrays. Applied Physics Letters, 106 (17). 172102. doi:10.1063/1.4919053 ISSN 0003-6951.
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Official URL: http://dx.doi.org/10.1063/1.4919053
Abstract
We report magnetotransport measurements of a SiGe heterostructure containing a 20 nm p-Ge quantum well with a mobility of 800 000 cm2 V−1 s−1. By dry etching arrays of wires with widths between 1.0 μm and 3.0 μm, we were able to measure the lateral depletion thickness, built-in potential, and the phase coherence length of the quantum well. Fourier analysis does not show any Rashba related spin-splitting despite clearly defined Shubnikov-de Haas oscillations being observed up to a filling factor of ν = 22. Exchange-enhanced spin-splitting is observed for filling factors below ν = 9. An analysis of boundary scattering effects indicates lateral depletion of the hole gas by 0.5 ± 0.1 μm from the etched germanium surface. The built-in potential is found to be 0.25 ± 0.04 V, presenting an energy barrier for lateral transport greater than the hole confinement energy. A large phase coherence length of 3.5 ± 0.5 μm is obtained in these wires at 1.7 K.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Applied Physics Letters | ||||
Publisher: | American Institute of Physics | ||||
ISSN: | 0003-6951 | ||||
Official Date: | 2015 | ||||
Dates: |
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Volume: | 106 | ||||
Number: | 17 | ||||
Article Number: | 172102 | ||||
DOI: | 10.1063/1.4919053 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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