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Scientists document first images of the atomic fingerprint of heat in quantum materials
Yichao Zhang led a team of researchers to image “moiré phasons” for the first time.
Zhang’s research team took on this challenge by using a new technique called “electron ptychography,” which achieved the highest resolution documented (better than 15 picometer) and detected blurring of individual atoms caused by thermal vibrations. Her work has revealed that spatially localized moiré phasons dominate thermal vibrations of twisted two-dimensional materials, which fundamentally reshaped how scientists understand its impact. Her breakthrough study, which confirmed the longstanding theoretical predictions of moiré phasons, also demonstrated that “electron ptychography” can be used to map thermal vibrations with atomic precision for the first time—which was previously an experimental capability out of reach.
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