发表机构
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences; School of Materials Science and Engineering, University of Science and Technology of China（中国科学院金属研究所沈阳材料科学国家研究中心; 中国科学技术大学材料科学与工程学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过在二维d波交错磁体中引入狄拉克锥，利用其高载流子迁移率和锥各向异性，同时实现高电荷-自旋转换效率（最高92%）与高电荷电导率，为高效自旋源材料设计提供了新途径。
AI 中文摘要
在磁随机存取存储器中，低临界电荷电流密度和低能量耗散是高度期望的，这要求自旋源同时具备高电荷-自旋转换效率（CSE）和高电荷电导率。具有消失净磁矩和自旋劈裂能带的交错磁体为自旋劈裂转矩磁随机存取存储器提供了有前景的自旋源候选材料。然而，在交错磁体中同时实现高CSE和高电荷电导率仍然具有挑战性。在本工作中，我们将狄拉克锥引入二维d波交错磁体，其固有的高载流子迁移率使得电荷和自旋电导率可调且具有高CSE。狄拉克锥的各向异性为增强CSE和电荷电导率提供了有效手段，锥体倾斜作为额外的可调性自由度。在此设计原则指导下，我们在Cr2SeTeS中识别出最大CSE为92%。当费米能级略微偏离狄拉克点时，可以同时实现高CSE、高电荷电导率以及由此产生的高自旋电导率。我们的研究通过狄拉克锥工程推进了对时间反演奇自旋输运的理解，并为开发兼具高电荷电导率与高效电荷-自旋转换的自旋源材料提供了实用途径。
英文摘要
Low critical charge-current density and low energy dissipation are highly desired in magnetic random-access memories, requiring spin sources to exhibit both high charge-to-spin conversion efficiency (CSE) and high charge conductivity. Altermagnets with vanishing net magnetic moment and spin-splitting bands provide promising spin-source candidates for spin-splitting-torque magnetic random-access memories. However, achieving both high CSE and charge conductivity remains challenging in altermagnets. In this work, we introduce Dirac cones into two-dimensional d-wave altermagnets, where their intrinsically high carrier mobility enables tunable charge and spin conductivities with high CSE. Dirac-cone anisotropy provides an effective means of enhancing both CSE and charge conductivity, with cone tilting serving as an additional degree of tunability. Guided by this design principle, we identify a maximum CSE of 92% in Cr2SeTeS. When the Fermi level moves slightly away from the Dirac point, high CSE, high charge conductivity, and the resulting high spin conductivity can be simultaneously achieved. Our study advances the understanding of time-reversal-odd spin transport via Dirac-cone engineering and provides a practical route toward developing spin-source materials that combine high charge conductivity with highly efficient charge-to-spin conversion.
