论文标题
用剪刀创建量子异常的绝缘子/超导体异质结构中的局部Majora零模式
Creating Localized Majorana Zero Modes in Quantum Anomalous Hall Insulator/Superconductor Heterostructures with a Scissor
论文作者
论文摘要
在这项工作中，我们证明，在量子异常的大厅绝缘子（QAHI）中进行切割（狭窄的真空制度）会创建一个具有拓扑保护的单螺旋通道，并通过反向传播的电子模式诱导超导率，并通过统治效应在螺旋频道上诱导超导率，从而产生Mapoarna Zero Zero Energy模式（MZMES MZMS）（mzmms）。在这种几何形状中，不需要邻近差距克服QAHI的宽大绝缘隙即可像二维QAHI/超导体（QAHI/SC）异质结构一样创建MZM。因此，具有MZMS的拓扑状态大大扩大。此外，由于存在单个螺旋通道，因此避免了由多个导电通道引起的低能量内缘结合状态的产生，以便可以将MZM与其他能量中的其他间隙激发良好分开。这种简单但实用的方法允许在具有复杂几何形状（例如基于测量的拓扑量子计算）的设备中创建大量MZM。我们进一步证明了如何通过控制反传播电子模式之间的耦合强度来执行MZM的编织。
In this work, we demonstrate that making a cut (a narrow vacuum regime) in the bulk of a quantum anomalous Hall insulator (QAHI) creates a topologically protected single helical channel with counter-propagating electron modes, and inducing superconductivity on the helical channel through proximity effect will create Majorana zero energy modes (MZMs) at the ends of the cut. In this geometry, there is no need for the proximity gap to overcome the bulk insulating gap of the QAHI to create MZMs as in the two-dimensional QAHI/superconductor (QAHI/SC) heterostructures. Therefore, the topological regime with MZMs is greatly enlarged. Furthermore, due to the presence of a single helical channel, the generation of low energy in-gap bound states caused by multiple conducting channels is avoided such that the MZMs can be well separated from other in-gap excitations in energy. This simple but practical approach allows the creation of a large number of MZMs in devices with complicated geometry such as hexons for measurement-based topological quantum computation. We further demonstrate how braiding of MZMs can be performed by controlling the coupling strength between the counter-propagating electron modes.
