EuCd₂As₂ has been widely considered as a leading candidate for the ideal Weyl semimetal. However, a recent study challenged this view by discovering a substantial band gap in this system. Here, the authors successfully synthesize highly insulating EuCd₂As₂. It reveals a decrease of the anomalous Hall conductivity (AHC) by orders of magnitude as the carrier density decreases, contradicting the expected behavior of intrinsic AHC generated by the Weyl points. The results suggest that EuCd₂As₂ is a magnetic semiconductor rather than a Weyl semimetal.
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Shi et al. (2024) studied this question.
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