Energy gap of topological surface states in proximity to a magnetic insulator
Abstract Topological surface-states can acquire an energy gap when time-reversal symmetry is broken by interfacing with a magnetic insulator. This gap has yet to be measured. Such topological-magnetic insulator heterostructures can host a quantized anomalous Hall effect and can allow the control of...
| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-08-01
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| Series: | Communications Physics |
| Online Access: | https://doi.org/10.1038/s42005-023-01327-5 |
| _version_ | 1827710679409229824 |
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| author | Jiashu Wang Tianyi Wang Mykhaylo Ozerov Zhan Zhang Joaquin Bermejo-Ortiz Seul-Ki Bac Hoai Trinh Maksym Zhukovskyi Tatyana Orlova Haile Ambaye Jong Keum Louis-Anne de Vaulchier Yves Guldner Dmitry Smirnov Valeria Lauter Xinyu Liu Badih A. Assaf |
| author_facet | Jiashu Wang Tianyi Wang Mykhaylo Ozerov Zhan Zhang Joaquin Bermejo-Ortiz Seul-Ki Bac Hoai Trinh Maksym Zhukovskyi Tatyana Orlova Haile Ambaye Jong Keum Louis-Anne de Vaulchier Yves Guldner Dmitry Smirnov Valeria Lauter Xinyu Liu Badih A. Assaf |
| author_sort | Jiashu Wang |
| collection | DOAJ |
| description | Abstract Topological surface-states can acquire an energy gap when time-reversal symmetry is broken by interfacing with a magnetic insulator. This gap has yet to be measured. Such topological-magnetic insulator heterostructures can host a quantized anomalous Hall effect and can allow the control of the magnetic state of the insulator in a spintronic device. In this work, we observe the energy gap of topological surface-states in proximity to a magnetic insulator using magnetooptical Landau level spectroscopy. We measure Pb1-xSnxSe–EuSe heterostructures grown by molecular beam epitaxy exhibiting a record mobility and low Fermi energy. Through temperature dependent measurements and theoretical calculations, we show this gap is likely due to quantum confinement and conclude that the magnetic proximity effect is weak in this system. This weakness is disadvantageous for the realization of the quantum anomalous Hall effect, but favorable for spintronic devices which require the preservation of spin-momentum locking at the Fermi level. |
| first_indexed | 2024-03-10T17:42:13Z |
| format | Article |
| id | doaj.art-e33e6f699c7445539d97b7b51d8c4624 |
| institution | Directory Open Access Journal |
| issn | 2399-3650 |
| language | English |
| last_indexed | 2024-03-10T17:42:13Z |
| publishDate | 2023-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Physics |
| spelling | doaj.art-e33e6f699c7445539d97b7b51d8c46242023-11-20T09:39:46ZengNature PortfolioCommunications Physics2399-36502023-08-01611910.1038/s42005-023-01327-5Energy gap of topological surface states in proximity to a magnetic insulatorJiashu Wang0Tianyi Wang1Mykhaylo Ozerov2Zhan Zhang3Joaquin Bermejo-Ortiz4Seul-Ki Bac5Hoai Trinh6Maksym Zhukovskyi7Tatyana Orlova8Haile Ambaye9Jong Keum10Louis-Anne de Vaulchier11Yves Guldner12Dmitry Smirnov13Valeria Lauter14Xinyu Liu15Badih A. Assaf16Department of Physics and Astronomy, University of Notre DameDepartment of Physics and Astronomy, University of Notre DameNational High Magnetic Fields Laboratory, Florida State UniversityX-ray Science Division, Advanced Photon Source, Argonne National LabLaboratoire de Physique de l’Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne UniversitéDepartment of Physics and Astronomy, University of Notre DameDepartment of Physics and Astronomy, University of Notre DameNotre Dame Integrated Imaging Facility, University of Notre DameNotre Dame Integrated Imaging Facility, University of Notre DameNeutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National LaboratoryNeutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National LaboratoryLaboratoire de Physique de l’Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne UniversitéLaboratoire de Physique de l’Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne UniversitéNational High Magnetic Fields Laboratory, Florida State UniversityNeutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National LaboratoryDepartment of Physics and Astronomy, University of Notre DameDepartment of Physics and Astronomy, University of Notre DameAbstract Topological surface-states can acquire an energy gap when time-reversal symmetry is broken by interfacing with a magnetic insulator. This gap has yet to be measured. Such topological-magnetic insulator heterostructures can host a quantized anomalous Hall effect and can allow the control of the magnetic state of the insulator in a spintronic device. In this work, we observe the energy gap of topological surface-states in proximity to a magnetic insulator using magnetooptical Landau level spectroscopy. We measure Pb1-xSnxSe–EuSe heterostructures grown by molecular beam epitaxy exhibiting a record mobility and low Fermi energy. Through temperature dependent measurements and theoretical calculations, we show this gap is likely due to quantum confinement and conclude that the magnetic proximity effect is weak in this system. This weakness is disadvantageous for the realization of the quantum anomalous Hall effect, but favorable for spintronic devices which require the preservation of spin-momentum locking at the Fermi level.https://doi.org/10.1038/s42005-023-01327-5 |
| spellingShingle | Jiashu Wang Tianyi Wang Mykhaylo Ozerov Zhan Zhang Joaquin Bermejo-Ortiz Seul-Ki Bac Hoai Trinh Maksym Zhukovskyi Tatyana Orlova Haile Ambaye Jong Keum Louis-Anne de Vaulchier Yves Guldner Dmitry Smirnov Valeria Lauter Xinyu Liu Badih A. Assaf Energy gap of topological surface states in proximity to a magnetic insulator Communications Physics |
| title | Energy gap of topological surface states in proximity to a magnetic insulator |
| title_full | Energy gap of topological surface states in proximity to a magnetic insulator |
| title_fullStr | Energy gap of topological surface states in proximity to a magnetic insulator |
| title_full_unstemmed | Energy gap of topological surface states in proximity to a magnetic insulator |
| title_short | Energy gap of topological surface states in proximity to a magnetic insulator |
| title_sort | energy gap of topological surface states in proximity to a magnetic insulator |
| url | https://doi.org/10.1038/s42005-023-01327-5 |
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