arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.08693cond-mat.mes-hallcond-mat.supr-con
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室温下拓扑超导体\b{eta} - PdBi2的大自旋电荷转换

Large spin to charge conversion in topological superconductor \b{eta}-PdBi2 at room temperature

Yang Li, Shi-jia Yang, Dali Sun, Yun-bin Sun, Yan Li, Eric Vetter, Rui Sun, Na Li, Xu Yang, Lei Su, Zi-zhao Gong, Zong-kai Xie, Jian-jun Zhao, Wei He, Xiang-qun… 展开作者

Yang Li, Shi-jia Yang, Dali Sun, Yun-bin Sun, Yan Li, Eric Vetter, Rui Sun, Na Li, Xu Yang, Lei Su, Zi-zhao Gong, Zong-kai Xie, Jian-jun Zhao, Wei He, Xiang-qun Zhang, Zhao-hua Cheng

摘要:

\b{eta} -PdBi 2由于其前所未有的自旋轨道相互作用(SOC)而具有同时具有拓扑表面态和超导态的潜在能力,引起了人们的广泛关注。虽然大多数工作只集中在研究其拓扑表面状态,自旋和电荷之间的耦合自由度在这类量子材料仍然没有探索。在这里,我们首先报告的自旋电荷转换的研究在\b{eta} -PdBi 2超导薄膜生长的分子束外延,利用自旋泵浦技术进行反自旋霍尔效应测量。我们发现Fe/ \b{eta} -PdBi_2的室温自旋霍尔角θ_SH=0.037。该值比已报道的常规超导体大一个数量级,与最好的SOC金属和拓扑绝缘体相当。我们的研究结果提供了一个途径,发展超导为基础的自旋电子学应用。

英文摘要:

\b{eta}-PdBi2 has attracted much attention for its prospective ability to possess simultaneously topological surface and superconducting states due to its unprecedented spin-orbit interaction (SOC). Whereas most works have focused solely on investigating its topological surface states, the coupling between spin and charge degrees of freedom in this class of quantum material remains unexplored. Here we first report a study of spin-to-charge conversion in a \b{eta}-PdBi2 ultrathin film grown by molecular beam epitaxy, utilizing a spin pumping technique to perform inverse spin Hall effect measurements. We find that the room temperature spin Hall angle of Fe/\b{eta}-PdBi2, θ_SH=0.037. This value is one order of magnitude larger than that of reported conventional superconductors, and is comparable to that of the best SOC metals and topological insulators. Our results provide an avenue for developing superconductor-based spintronic applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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