{"id":21331,"date":"2026-10-14T12:06:36","date_gmt":"2026-10-14T12:06:36","guid":{"rendered":"https:\/\/news.theck1.no\/?p=21331"},"modified":"2026-10-14T12:06:36","modified_gmt":"2026-10-14T12:06:36","slug":"new-topological-microscope-tip-reveals-evidence-of-2d-altermagnetism","status":"publish","type":"post","link":"https:\/\/news.theck1.no\/?p=21331","title":{"rendered":"New topological microscope tip reveals evidence of 2D altermagnetism"},"content":{"rendered":"

AI-rewritten:<\/strong> This is a summary of an article from Phys.org, rewritten by AI (Qwen, running locally) to make it easier to read. The facts come from the original article – read it for the full story.<\/p>\n

Phys.org • October 13, 2026<\/strong><\/div>\n\n

Researchers from the University of Science and Technology of China and other institutions created a specialized scanning tunneling microscope tip to detect spin-related electronic states at the atomic level. Led by Chen Xianhui and Wang Zhenyu, the team shaped single crystals into probes that function based on the quantum spin Hall effect. In this phenomenon, electrons moving along an edge of a material possess opposite spins depending on their direction of travel. The fabricated tips can resolve individual atoms while maintaining spectral features consistent with these helical edge channels.<\/p>\n

<\/p>\n

To validate the probe’s capabilities, the team tested it on two known magnets, Fe\u2081\u208a\u2093Te and FeGe. In both cases, reversing the voltage polarity caused a reversal in magnetic-stripe contrast or a change in layer contrast due to spin-flop transitions. The researchers then applied this tip to KV\u2082Se\u2082O, a candidate material for 2D altermagnetism. Altermagnets lack net magnetization but exhibit unique band splitting patterns that alternate across momentum space.<\/p>\n

Analysis of images taken at opposite voltage polarities revealed a real-space pattern consistent with checkerboard antiferromagnetism on the KV\u2082Se\u2082O surface. Magnetic-field spectroscopy showed that defect-associated excitations shifted in opposite ways along two orthogonal crystal directions, supporting opposite spin polarizations. Additionally, quasiparticle interference patterns rotated by 90 degrees when bias polarity reversed, a behavior not seen with conventional nonmagnetic tips. These findings, supported by theoretical analysis, indicate d-wave altermagnetic order on the material’s surface layer.<\/p>\n

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Source:<\/strong> Phys.org • October 13, 2026<\/p>\n

Read the original article at Phys.org →<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

AI-rewritten: This is a summary of an article from Phys.org, rewritten by AI (Qwen, running locally) to make it easier to read. The facts come from the original article – read it for the full story. Phys.org • October 13, 2026 Researchers from the University of Science and Technology of China and other institutions created<\/p>\n

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