论文标题
控制抗铁磁拓扑绝缘子表面上的量子点连接器
Controlling a quantum point junction on the surface of an antiferromagnetic topological insulator
论文作者
论文摘要
拓扑的抽象概念导致了对真实材料的深刻见解。值得注意的是，拓扑材料的表面和边缘可以托管物理，例如单向电荷或自旋传输，在孤立的一维系统和二维系统中不可用。但是，为了充分控制边缘波函数的混合和干扰，需要稳健且可调的连接。我们建议使用抗磁性拓扑绝缘子来实现此控制，该抗铁磁拓扑绝缘子在其表面上支持两种不同类型的无间隙单向通道，一种来自抗磁性域壁，另一个来自单高步骤。这些边缘模式的独特几何性质使它们可以鲁棒地相交以形成量子点连接，并且它们在表面的存在使它们受到磁性和静电尖端（如扫描探针显微镜中使用的磁性和静电尖端）的控制。最近的候选候选提案鼓励实现这种交界的前景，这可能导致量子计算和传感中令人兴奋的应用。
The abstract notion of topology has led to profound insights into real materials. Notably, the surface and edges of topological materials can host physics, such as unidirectional charge or spin transport, that is unavailable in isolated one- and two-dimensional systems. However, to fully control the mixing and interference of edge-state wave functions, one needs robust and tunable junctions. We propose to achieve this control using an antiferromagnetic topological insulator that supports two distinct types of gapless unidirectional channels on its surface, one from antiferromagnetic domain walls and the other from single-height steps. The distinct geometric nature of these edge modes allows them to intersect robustly to form quantum point junctions, and their presence at the surface makes them subject to control by magnetic and electrostatic tips like those used in scanning probe microscopes. Prospects for realizing such junctions are encouraged by recent material candidate proposals, potentially leading to exciting applications in quantum computing and sensing.
