论文标题
拓扑表面状态的能隙与磁绝缘子接近
Energy gap of topological surface states in proximity to a magnetic insulator
论文作者
论文摘要
当时间反转对称性通过与磁绝缘体接口打破时，拓扑表面状态可以获得能量差距。该差距尚未衡量。这样的拓扑磁绝缘子异质结构可以托管量化的异常霍尔效应，并可以控制自旋装置中绝缘体的磁态。在这项工作中，我们使用Magnetportic Landau水平光谱观察到拓扑表面验证型的拓扑表面状态的能隙。我们测量通过具有创纪录的迁移率和低费米能量的分子束外延生长的PB1-XSNXSE/EUSE异质结构。通过依赖温度的测量和理论计算，我们表明该差距可能是由于量子限制所致，并得出结论，该系统中的磁接近效应较弱。这种弱点对于实现量子异常效应的弱点是不利的，但有利于需要在费米水平上保存旋转摩托明锁的自旋装置。
Topological surface-states can acquire an energy gap when time-reversal symmetry is broken by interfacing with a magnetic insulator. This gap has yet to be measured. Such topological-magnetic insulator heterostructures can host a quantized anomalous Hall effect and can allow the control of the magnetic state of the insulator in a spintronic device. In this work, we observe the energy gap of topological surface-states in proximity to a magnetic insulator using magnetooptical Landau level spectroscopy. We measure Pb1-xSnxSe/EuSe heterostructures grown by molecular beam epitaxy exhibiting a record mobility and low Fermi energy. Through temperature dependent measurements and theoretical calculations, we show this gap is likely due to quantum confinement and conclude that the magnetic proximity effect is weak in this system. This weakness is disadvantageous for the realization of the quantum anomalous Hall effect, but favorable for spintronic devices which require the preservation of spin-momentum locking at the Fermi level.
