Majorana zero modes (MZMs) that obey the non-Abelian statistics have been intensively investigated for potential applications in topological quantum computing. The prevailing signals in tunneling experiments “fingerprinting” the existence of MZMs are the zero-energy bound states (ZEBSs). However, nearly all of the previously reported ZEBSs showing signatures of the MZMs are observed in difficult-to-fabricate heterostructures at very low temperatures and additionally require applied magnetic field. Here, by using in situ scanning tunneling spectroscopy, we detect the ZEBSs upon the interstitial Fe adatoms deposited on two different high-temperature superconducting one-unit-cell iron chalcogenides on SrTiO₃(001). The spectroscopic results resemble the phenomenological characteristics of the MZMs inside the vortex cores of topological superconductors. Our experimental findings may extend the MZM explorations in connate topological superconductors toward an applicable temperature regime and down to the two-dimensional (2D) limit.

服从非阿贝尔统计的马约拉纳零模式（MZM）已被广泛研究以用于拓扑量子计算中的潜在应用。在隧道实验中“印记” MZM存在的主要信号是零能束缚态（ZEBS）。但是，几乎所有先前报告的显示MZM签名的ZEBS都在非常低的温度下难以制造的异质结构中观察到，并且还需要施加磁场。在这里，通过使用原位扫描隧道光谱法，我们检测到在SrTiO ₃上沉积在两个不同的高温超导单晶铁硫属元素化物上的间质Fe原子上的ZEBSs（001）。光谱结果类似于拓扑超导体涡旋核内部MZM的现象学特征。我们的实验结果可能会将MZM在原生拓扑超导体中的探索扩展到适用的温度范围，并降低到二维（2D）极限。