Berry curvature-induced transport signature for altermagnetic order
Abstract Altermagnetism has been detected in several materials using spin-sensitive probes. These measurements require rather complex setups that make it challenging to track variations in altermagnetic order, e.g., to identify a temperature-tuned altermagnetic phase transition. We propose a simple...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-07-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-025-00805-z |
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| author | T. Farajollahpour R. Ganesh K. V. Samokhin |
| author_facet | T. Farajollahpour R. Ganesh K. V. Samokhin |
| author_sort | T. Farajollahpour |
| collection | DOAJ |
| description | Abstract Altermagnetism has been detected in several materials using spin-sensitive probes. These measurements require rather complex setups that make it challenging to track variations in altermagnetic order, e.g., to identify a temperature-tuned altermagnetic phase transition. We propose a simple transport measurement that can probe the order parameter for d-wave altermagnetism. We suggest magnetoconductivity anisotropy—the difference between the two principal values of the magnetoconductivity tensor. This quantity can be easily measured as a function of temperature, without any spin-selective apparatus. It acquires a nonzero value in a C 4 K phase, where C 4 rotations and time reversal K are not symmetries but their combination is. This effect can be traced to the modification of phase space density due to Berry curvature, which we demonstrate using semiclassical equations of motion for band electrons. As an illustration, we build a minimal tight-binding model with altermagnetic order that breaks C 4 and K symmetries while preserving C 4 K. |
| format | Article |
| id | doaj-art-b82d185f3d4a4e4fa309095f406903e3 |
| institution | Kabale University |
| issn | 2397-4648 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Materials |
| spelling | doaj-art-b82d185f3d4a4e4fa309095f406903e32025-08-20T03:42:30ZengNature Portfolionpj Quantum Materials2397-46482025-07-011011610.1038/s41535-025-00805-zBerry curvature-induced transport signature for altermagnetic orderT. Farajollahpour0R. Ganesh1K. V. Samokhin2Department of Physics, Brock UniversityDepartment of Physics, Brock UniversityDepartment of Physics, Brock UniversityAbstract Altermagnetism has been detected in several materials using spin-sensitive probes. These measurements require rather complex setups that make it challenging to track variations in altermagnetic order, e.g., to identify a temperature-tuned altermagnetic phase transition. We propose a simple transport measurement that can probe the order parameter for d-wave altermagnetism. We suggest magnetoconductivity anisotropy—the difference between the two principal values of the magnetoconductivity tensor. This quantity can be easily measured as a function of temperature, without any spin-selective apparatus. It acquires a nonzero value in a C 4 K phase, where C 4 rotations and time reversal K are not symmetries but their combination is. This effect can be traced to the modification of phase space density due to Berry curvature, which we demonstrate using semiclassical equations of motion for band electrons. As an illustration, we build a minimal tight-binding model with altermagnetic order that breaks C 4 and K symmetries while preserving C 4 K.https://doi.org/10.1038/s41535-025-00805-z |
| spellingShingle | T. Farajollahpour R. Ganesh K. V. Samokhin Berry curvature-induced transport signature for altermagnetic order npj Quantum Materials |
| title | Berry curvature-induced transport signature for altermagnetic order |
| title_full | Berry curvature-induced transport signature for altermagnetic order |
| title_fullStr | Berry curvature-induced transport signature for altermagnetic order |
| title_full_unstemmed | Berry curvature-induced transport signature for altermagnetic order |
| title_short | Berry curvature-induced transport signature for altermagnetic order |
| title_sort | berry curvature induced transport signature for altermagnetic order |
| url | https://doi.org/10.1038/s41535-025-00805-z |
| work_keys_str_mv | AT tfarajollahpour berrycurvatureinducedtransportsignatureforaltermagneticorder AT rganesh berrycurvatureinducedtransportsignatureforaltermagneticorder AT kvsamokhin berrycurvatureinducedtransportsignatureforaltermagneticorder |