论文标题
二维拓扑绝缘子中的紧急量子厅效果低于$ 50 $ MT
Emergent quantum Hall effects below $50$ mT in a two-dimensional topological insulator
论文作者
论文摘要
HGTE量子井中的量子自旋效应的实现导致了拓扑材料的发展，拓扑材料与磁性和超导性结合使用，预计可以携带手性少量植物。但是，在常规量子异常的霍尔系统中，大型磁化（$ \ sim $少数特斯拉）使诱导超导性的挑战。在这里，我们报告了HGTE量子孔中的两个不同的新兴量子霍尔的效应，与MN合金合金。首先，一个新颖的量子大厅状态从量子旋转大厅州出现，在一个异常低的磁场为$ \ sim 50 $ mt。其次，为了调整批量$ p $ - 政权，我们在田野的多个量子厅高原上低至$ 20-30 $ MT，在Valence Band中，运输由Van Hove奇异性主导。这些新兴的量子大厅现象批判性地依赖于HGTE的拓扑结构，并且它们在非常低的场地中的发生使它们成为与超导体接口的理想候选者，以实现手性主要植物效率。
The realization of the quantum spin Hall effect in HgTe quantum wells has led to the development of topological materials which, in combination with magnetism and superconductivity, are predicted to host chiral Majorana fermions. However, the large magnetization ($\sim$ a few tesla) in conventional quantum anomalous Hall system, makes it challenging to induce superconductivity. Here, we report two different emergent quantum Hall effects in HgTe quantum wells dilutely alloyed with Mn. Firstly, a novel quantum Hall state emerges from the quantum spin Hall state at an exceptionally low magnetic field of $\sim 50$ mT. Secondly, tuning towards the bulk $p$-regime, we resolve multiple quantum Hall plateaus at fields as low as $20 - 30$ mT, where transport is dominated by a van Hove singularity in the valence band. These emergent quantum Hall phenomena rely critically on the topological band structure of HgTe and their occurrence at very low fields make them an ideal candidate for interfacing with superconductors to realize chiral Majorana fermions.
