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Chinese researchers have engineered a scanning tunneling microscope (STM) tip using α-Bi₄Br₄ single crystals to detect altermagnetism, a rare magnetic state without net magnetization, in 2D materials. By leveraging the quantum spin Hall effect and helical edge states, this novel probe resolves atomic-scale spin-dependent electronic behaviors that conventional tips miss. The breakthrough links local atomic structure to specific scattering patterns, offering new tools for probing exotic quantum phases in condensed matter physics.

Source coveringQuantum Zeitgeist

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Quantum microscope tip spots rare magnetism in 2D material

Quantum ZeitgeistOctober 14, 20263 min read

Chinese researchers developed a scanning tunneling microscope (STM) tip, leveraging the quantum spin Hall effect, to detect altermagnetism in 2D KV 2 Se 2 O. This new probe reveals subtle magnetic order with no net magnetization.

Researchers of China have fashioned scanning tunneling microscope tips from α-Bi 4 Br 4 single crystals, a novel approach enabling the detection of altermagnetism, a surprising form of magnetism lacking net magnetization, at the atomic level. The team led by CHEN Xianhui and WANG Zhenyu demonstrated the technique by…

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