量子反常霍尔磁性薄膜/超导异质结制备及手性拓扑超导性能研究

能承载马约拉纳费米子的材料，将有效保护脆弱的量子态不受侵害，被认为是实现未来拓扑量子计算的材料载体，因此具有重大的科学意义和巨大的应用前景。将分别具有超导/量子反常霍尔态的材料做成异质结结构，将超导中的电子对引入到量子反常霍尔效应手性拓扑边态中，即可实现手性拓扑超导电性，并能承载马约拉纳费米子。本项目利用申请人及合作者具有多年研究超导薄膜和量子反常霍尔态磁性薄膜的经验，将利用具有多种图案结构掩膜的分子束外延设备，制备原子级平整且晶格匹配的量子反常霍尔效应/超导异质结以及量子反常霍尔效应/绝缘层/超导异质结，实现欧姆接触和非欧姆接触两种低杂质态的干净界面异质结系列样品。通过构建该样品体系，可以研究各种界面条件影响实现半整数量子化电导和一维手性马约拉纳费米子模的影响因素和规律。深入研究承载一维手性马约拉纳费米子膜的材料体系具有重要的科学意义。

Materials that can carry Majorana Fermion will effectively protect the fragile quantum states. Thus they are considered as the basic materials for realizing future high-performance topological quantum computing. Therefore, this field has great scientific significance and application prospects. It was predicted that the chiral Majorana fermion can be realized by introducing the cooper pairs of the superconducting materials into the chiral topological edge states of the quantum anomalous Hall effect. In past years, the applicant has studied superconducting thin films and quantum anomalous Hall effect magnetic films(QAHEMF). In this project, the QAHEMF/superconductor heterojunction and QAHEMF/barrier/superconductor heterojunction films with atomic-smooth lattice-matching interface will be in-situ fabricated by molecular beam epitaxy (MBE) technology to achieve chiral topological superconductivity(CTS). Several kinds of masks were set onto the MBE equipment and then were used to fabricate QAHEMF and superconducting films respectively. So we can design and fabricate the structure of two kinds of materials with two different patterns such as QAHEMF/CTS/QAHEMF structure, and then the transport signal and the relationship between the half quantum conductivity and the one-dimensional chiral Majorana Fermion can be studied. This study on chiral Majorana Fermion by achieving higher quality CTS samples has great scientific significance.