论文标题
嵌入半导体结构中的锌 - 蓝富仙单层中的铁磁和巨型磁势
Ferromagnetism and giant magnetoresistance in zinc-blende FeAs monolayers embedded in semiconductor structures
论文作者
论文摘要
含有四面体纤维键的材料结构，取决于其密度和几何分布，可以容纳从超导性到铁磁性的几种相互竞争的量子基态。在这里，我们检查了四面体Fe-AS键的准二维（2D）层的结构，该键嵌入了半导体INAS矩阵中的常规间隔，这类似于基于Fe的超导体的晶体结构。与基于Fe的pnictides的情况相反，这些富裕/INAS超级晶格（SLS）表现出铁磁性，其居里温度（TC）随着INAS间隔厚度T_INAS（TC〜T_INAS^-3）的减小而迅速增加，并且磁磁性非常大，直至500％，直至500％。我们的第一原则计算揭示了Fe原子位置无序位置在这些准2D仙女SLS中建立铁磁性中的重要作用。这些独特的功能标志着养父/INAS SLS是用于自旋应用程序的有希望的结构。
Material structures containing tetrahedral FeAs bonds, depending on their density and geometrical distribution, can host several competing quantum ground states ranging from superconductivity to ferromagnetism. Here we examine structures of quasi two-dimensional (2D) layers of tetrahedral Fe-As bonds embedded with a regular interval in a semiconductor InAs matrix, which resembles the crystal structure of Fe-based superconductors. Contrary to the case of Fe-based pnictides, these FeAs/InAs superlattices (SLs) exhibit ferromagnetism, whose Curie temperature (Tc) increases rapidly with decreasing the InAs interval thickness t_InAs (Tc ~ t_InAs^-3), and an extremely large magnetoresistance up to 500% that is tunable by a gate voltage. Our first principles calculations reveal the important role of disordered positions of Fe atoms in the establishment of ferromagnetism in these quasi-2D FeAs-based SLs. These unique features mark the FeAs/InAs SLs as promising structures for spintronic applications.
