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Influence of Device Geometry and Imperfections on the Interpretation of Transverse Magnetic Focusing Experiments
Spatially separating electrons of different spins and efficiently generating spin currents are crucial steps towards building practical spintronics devices. Transverse magnetic focusing is a potential technique to accomplish both those tasks. In a material where there is significant Rashba spin–orbi...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer US
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8898212/ https://www.ncbi.nlm.nih.gov/pubmed/35247127 http://dx.doi.org/10.1186/s11671-022-03671-x |
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author | Lee, Yik Kheng Smith, Jackson S. Cole, Jared H. |
author_facet | Lee, Yik Kheng Smith, Jackson S. Cole, Jared H. |
author_sort | Lee, Yik Kheng |
collection | PubMed |
description | Spatially separating electrons of different spins and efficiently generating spin currents are crucial steps towards building practical spintronics devices. Transverse magnetic focusing is a potential technique to accomplish both those tasks. In a material where there is significant Rashba spin–orbit interaction, electrons of different spins will traverse different paths in the presence of an external magnetic field. Experiments have demonstrated the viability of this technique by measuring conductance spectra that indicate the separation of spin-up and spin-down electrons. However the effect that the geometry of the leads has on these measurements is not well understood. By simulating an InGaAs-based transverse magnetic focusing device, we show that the resolution of features in the conductance spectra is affected by the shape, separation and width of the leads. Furthermore, the number of subbands occupied by the electrons in the leads affects the ratio between the amplitudes of the spin-split peaks in the spectra. We simulated devices with random onsite potentials and observed that transverse magnetic focusing devices are sensitive to disorder. Ultimately we show that careful choice and characterisation of device geometry are crucial for correctly interpreting the results of transverse magnetic focusing experiments. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s11671-022-03671-x. |
format | Online Article Text |
id | pubmed-8898212 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Springer US |
record_format | MEDLINE/PubMed |
spelling | pubmed-88982122022-03-08 Influence of Device Geometry and Imperfections on the Interpretation of Transverse Magnetic Focusing Experiments Lee, Yik Kheng Smith, Jackson S. Cole, Jared H. Nanoscale Res Lett Nano Express Spatially separating electrons of different spins and efficiently generating spin currents are crucial steps towards building practical spintronics devices. Transverse magnetic focusing is a potential technique to accomplish both those tasks. In a material where there is significant Rashba spin–orbit interaction, electrons of different spins will traverse different paths in the presence of an external magnetic field. Experiments have demonstrated the viability of this technique by measuring conductance spectra that indicate the separation of spin-up and spin-down electrons. However the effect that the geometry of the leads has on these measurements is not well understood. By simulating an InGaAs-based transverse magnetic focusing device, we show that the resolution of features in the conductance spectra is affected by the shape, separation and width of the leads. Furthermore, the number of subbands occupied by the electrons in the leads affects the ratio between the amplitudes of the spin-split peaks in the spectra. We simulated devices with random onsite potentials and observed that transverse magnetic focusing devices are sensitive to disorder. Ultimately we show that careful choice and characterisation of device geometry are crucial for correctly interpreting the results of transverse magnetic focusing experiments. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s11671-022-03671-x. Springer US 2022-03-05 /pmc/articles/PMC8898212/ /pubmed/35247127 http://dx.doi.org/10.1186/s11671-022-03671-x Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Nano Express Lee, Yik Kheng Smith, Jackson S. Cole, Jared H. Influence of Device Geometry and Imperfections on the Interpretation of Transverse Magnetic Focusing Experiments |
title | Influence of Device Geometry and Imperfections on the Interpretation of Transverse Magnetic Focusing Experiments |
title_full | Influence of Device Geometry and Imperfections on the Interpretation of Transverse Magnetic Focusing Experiments |
title_fullStr | Influence of Device Geometry and Imperfections on the Interpretation of Transverse Magnetic Focusing Experiments |
title_full_unstemmed | Influence of Device Geometry and Imperfections on the Interpretation of Transverse Magnetic Focusing Experiments |
title_short | Influence of Device Geometry and Imperfections on the Interpretation of Transverse Magnetic Focusing Experiments |
title_sort | influence of device geometry and imperfections on the interpretation of transverse magnetic focusing experiments |
topic | Nano Express |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8898212/ https://www.ncbi.nlm.nih.gov/pubmed/35247127 http://dx.doi.org/10.1186/s11671-022-03671-x |
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