发表机构
Leibniz IFW Dresden（莱布尼茨IFW德累斯顿）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
重新分析 O'Leary 等人的 ARPES 数据，发现各向异性超导能隙与色散回弯，证实 t-PtBi$_2$ 表面超导性，并揭示低能抑制持续至 19 K。
AI 中文摘要
角分辨光电子能谱（ARPES）和扫描隧道谱已确立了外尔半金属 t-PtBi$_2$ 中的表面超导电性，而 O'Leary 等人从一项独立的 ARPES 实验中得出结论，认为在 3 K 以上不存在超导特征。在此，我们重新分析了 O'Leary 等人沉积的完整数据。仅使用实验确定的动量分布曲线（MDC）最大值、能量分布曲线（EDC）峰位和前沿，我们发现了一个强各向异性的低能隙和色散回弯，其大小和角度依赖性与 Changdar 等人独立报告的结果高度吻合。我们进一步表明，参考文献~\cite{Oleary} 中的温度依赖数据来自另一个表面终止，并且是在使用温度依赖的能量平移、动量平移和动量重标度后呈现的。利用金属体费米截止对原始温度依赖数据集进行配准，揭示了四个费米交叉点处分别约为 2、2、1 和 0.8 meV 的有限能隙。因此，O'Leary 等人独立获取的数据（来自不同样品、使用不同光子能量）非但不矛盾，反而证实了先前报道的各向异性超导能隙，并进一步表明各向异性的低能抑制持续到 19 K。
英文摘要
Angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling spectroscopy have established surface superconductivity in the Weyl semimetal t-PtBi$_2$, whereas O'Leary et al. concluded from an independent ARPES experiment that superconducting signatures are absent above 3 K. Here we reanalyze the complete deposited data of O'Leary et al. Using only experimentally determined momentum-distribution-curve (MDC) maxima, energy-distribution-curve (EDC) peak positions, and leading edges, we find a strongly anisotropic low-energy gap and dispersion back-bending that closely reproduce the magnitude and angular dependence reported independently by Changdar et al. We further show that the temperature-dependent data of Ref.~\cite{Oleary} originate from the other surface termination and were presented using temperature-dependent energy translations, momentum translations, and momentum rescalings. Registering the original temperature-dependent datasets using the metallic bulk Fermi cutoff reveals finite gaps of approximately 2, 2, 1, and 0.8 meV at the four Fermi crossings. Thus the independently acquired data of O'Leary et al., obtained on different samples and with a different photon energy, confirm rather than contradict the previously reported anisotropic superconducting gap and additionally show that an anisotropic low-energy suppression persists to 19 K.
CommentsComment on arXiv:2503.08841
