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Observation of chiral currents at the magnetic domain boundary of a topological insulator.

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Title: Observation of chiral currents at the magnetic domain boundary of a topological insulator.
Authors: Wang, Y. H., Kirtley, J. R., Katmis, F., Jarillo-Herrero, P., Moodera, J. S., Moler, K. A.
Source: Science (pre-March 2025). 8/28/2015, Vol. 349 Issue 6251, p948-952. 5p.
Subjects: Topological insulators, Chirality, Superconductors, Magnetization, Magnetoelectronics
Abstract: A magnetic domain boundary on the surface of a three-dimensional topological insulator is predicted to host a chiral edge state, but direct demonstration is challenging.We used a scanning superconducting quantum interference device to show that current in a magnetized topological insulator heterostructure (EuS/Bi2Se3)f lows at the edge when the Fermi level is gate-tuned to the surface band gap.We further induced micrometer-scale magnetic structures on the heterostructure and detected a chiral edge current at the magnetic domain boundary. The chirality of the current was determined bymagnetization of the surrounding domain, and its magnitude by the local chemical potential rather than the applied current. Such magnetic structures provide a platformfor detecting topologicalmagnetoelectric effects andmay enable progress in quantum information processing and spintronics. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Observation of chiral currents at the magnetic domain boundary of a topological insulator.
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  Data: <searchLink fieldCode="AR" term="%22Wang%2C+Y%2E+H%2E%22">Wang, Y. H.</searchLink><br /><searchLink fieldCode="AR" term="%22Kirtley%2C+J%2E+R%2E%22">Kirtley, J. R.</searchLink><br /><searchLink fieldCode="AR" term="%22Katmis%2C+F%2E%22">Katmis, F.</searchLink><br /><searchLink fieldCode="AR" term="%22Jarillo-Herrero%2C+P%2E%22">Jarillo-Herrero, P.</searchLink><br /><searchLink fieldCode="AR" term="%22Moodera%2C+J%2E+S%2E%22">Moodera, J. S.</searchLink><br /><searchLink fieldCode="AR" term="%22Moler%2C+K%2E+A%2E%22">Moler, K. A.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 8/28/2015, Vol. 349 Issue 6251, p948-952. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Topological+insulators%22">Topological insulators</searchLink><br /><searchLink fieldCode="DE" term="%22Chirality%22">Chirality</searchLink><br /><searchLink fieldCode="DE" term="%22Superconductors%22">Superconductors</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetization%22">Magnetization</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetoelectronics%22">Magnetoelectronics</searchLink>
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  Label: Abstract
  Group: Ab
  Data: A magnetic domain boundary on the surface of a three-dimensional topological insulator is predicted to host a chiral edge state, but direct demonstration is challenging.We used a scanning superconducting quantum interference device to show that current in a magnetized topological insulator heterostructure (EuS/Bi2Se3)f lows at the edge when the Fermi level is gate-tuned to the surface band gap.We further induced micrometer-scale magnetic structures on the heterostructure and detected a chiral edge current at the magnetic domain boundary. The chirality of the current was determined bymagnetization of the surrounding domain, and its magnitude by the local chemical potential rather than the applied current. Such magnetic structures provide a platformfor detecting topologicalmagnetoelectric effects andmay enable progress in quantum information processing and spintronics. [ABSTRACT FROM AUTHOR]
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  Label:
  Group: Ab
  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1126/science.aaa0508
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        Text: English
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        Type: general
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      – SubjectFull: Superconductors
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              Text: 8/28/2015
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