Spin transport properties in a topological insulator sandwiched between two-dimensional magnetic layers
Abstract Non-trivial band topology along with magnetism leads to different novel quantum phases. When time-reversal symmetry is broken in three-dimensional topological insulators (TIs) through, e.g., the proximity effect, different phases such as the quantum Hall phase or the quantum anomalous Hall(...
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Nature Portfolio
2025-01-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-024-80694-7 |
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| author | Nezhat Pournaghavi Banasree Sadhukhan Anna Delin |
| author_facet | Nezhat Pournaghavi Banasree Sadhukhan Anna Delin |
| author_sort | Nezhat Pournaghavi |
| collection | DOAJ |
| description | Abstract Non-trivial band topology along with magnetism leads to different novel quantum phases. When time-reversal symmetry is broken in three-dimensional topological insulators (TIs) through, e.g., the proximity effect, different phases such as the quantum Hall phase or the quantum anomalous Hall(QAH) phase emerge, displaying interesting transport properties for spintronic applications. The QAH phase displays sidewall chiral edge states, which leads to the QAH effect. We have considered a heterostructure consisting of a TI, namely Bi $$_2$$ Se $$_3$$ , sandwiched between two two-dimensional ferromagnetic monolayers of CrI $$_3$$ , to study how its topological and transport properties change due to the proximity effect. Combining DFT and tight-binding calculations, along with non-equilibrium Green’s function formalism, we show that a well-defined exchange gap appears in the band structure in which spin-polarised edge states flow. In a finite slab, the nature of the surface states depends on both the cross-section and thickness of the system. Therefore, we also study the width and finite-size effects on the transmission and topological properties of this magnetised TI nanoribbon. |
| format | Article |
| id | doaj-art-6f2b260c0be34cc29754917a0342509d |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-6f2b260c0be34cc29754917a0342509d2025-01-19T12:23:53ZengNature PortfolioScientific Reports2045-23222025-01-011511910.1038/s41598-024-80694-7Spin transport properties in a topological insulator sandwiched between two-dimensional magnetic layersNezhat Pournaghavi0Banasree Sadhukhan1Anna Delin2Department of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, AlbaNova University CenterDepartment of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, AlbaNova University CenterDepartment of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, AlbaNova University CenterAbstract Non-trivial band topology along with magnetism leads to different novel quantum phases. When time-reversal symmetry is broken in three-dimensional topological insulators (TIs) through, e.g., the proximity effect, different phases such as the quantum Hall phase or the quantum anomalous Hall(QAH) phase emerge, displaying interesting transport properties for spintronic applications. The QAH phase displays sidewall chiral edge states, which leads to the QAH effect. We have considered a heterostructure consisting of a TI, namely Bi $$_2$$ Se $$_3$$ , sandwiched between two two-dimensional ferromagnetic monolayers of CrI $$_3$$ , to study how its topological and transport properties change due to the proximity effect. Combining DFT and tight-binding calculations, along with non-equilibrium Green’s function formalism, we show that a well-defined exchange gap appears in the band structure in which spin-polarised edge states flow. In a finite slab, the nature of the surface states depends on both the cross-section and thickness of the system. Therefore, we also study the width and finite-size effects on the transmission and topological properties of this magnetised TI nanoribbon.https://doi.org/10.1038/s41598-024-80694-7 |
| spellingShingle | Nezhat Pournaghavi Banasree Sadhukhan Anna Delin Spin transport properties in a topological insulator sandwiched between two-dimensional magnetic layers Scientific Reports |
| title | Spin transport properties in a topological insulator sandwiched between two-dimensional magnetic layers |
| title_full | Spin transport properties in a topological insulator sandwiched between two-dimensional magnetic layers |
| title_fullStr | Spin transport properties in a topological insulator sandwiched between two-dimensional magnetic layers |
| title_full_unstemmed | Spin transport properties in a topological insulator sandwiched between two-dimensional magnetic layers |
| title_short | Spin transport properties in a topological insulator sandwiched between two-dimensional magnetic layers |
| title_sort | spin transport properties in a topological insulator sandwiched between two dimensional magnetic layers |
| url | https://doi.org/10.1038/s41598-024-80694-7 |
| work_keys_str_mv | AT nezhatpournaghavi spintransportpropertiesinatopologicalinsulatorsandwichedbetweentwodimensionalmagneticlayers AT banasreesadhukhan spintransportpropertiesinatopologicalinsulatorsandwichedbetweentwodimensionalmagneticlayers AT annadelin spintransportpropertiesinatopologicalinsulatorsandwichedbetweentwodimensionalmagneticlayers |