Watching quantum behavior in action: MagnetoARPES reveals time-reversal symmetry breaking in a kagome superconductor

Rice University researchers Jianwei Huang and Ming Yi have developed magnetoARPES, a breakthrough technique extending angle-resolved photoemission spectroscopy (ARPES) to observe previously unresolved quantum behaviors in advanced materials. The innovation enables direct observation of time-reversal symmetry breaking—a key quantum phenomenon—in kagome superconductors, materials with unique geometric electron structures that may unlock high-temperature superconductivity. Published in Nature Physics (March 2026), the study demonstrates magnetoARPES’s ability to probe electron interactions and magnetic properties in real time, addressing long-standing limitations of conventional ARPES. This advancement could accelerate the design of quantum materials by revealing hidden electronic states critical for next-generation superconductors, topological insulators, and quantum computing components. The technique’s precision offers unprecedented insights into how electron behavior governs material properties, potentially revolutionizing energy-efficient technologies and quantum device development.