论文标题
拓扑磁铁MNBI2TE4中的量子异常层效应4
Quantum Anomalous Layer Hall Effect in the Topological Magnet MnBi2Te4
论文作者
论文摘要
最近，在均匀的二维抗铁磁性（AFM）MNBI2TE4中报道了一种不寻常的层锁定浆果曲率引起的大厅效应，称为层霍尔效应（LHE）[A. Gao等人，自然595，521（2021）]。在这项工作中，我们报告说，在MNBI2TE4中可以实现LHE的量化，我们称之为量子异常层效应（Qalhe）。 Qalhe起源于通过Vertielectric Cal场从费米海（Fermi Sea）踢出一层锁定的浆果 - 冰箱单子。值得注意的是，我们证明了电场逆转可以在均匀的AFM相中切换Qalhe量化大厅电导的迹象。 Qalhe也可以在铁磁阶段实现。这些结果为浆果曲率单极和拓扑磁铁的量化运输提供了一种有希望的方法。
Recently, a type of Hall effect due to an unusual layer-locked Berry curvature called the layer Hall effect (LHE) has been reported in the even-layered two-dimensional antiferromagnetic (AFM) MnBi2Te4 [A. Gao et.al, Nature 595, 521 (2021)]. In this work, we report that the quantization of LHE, which we call the quantum anomalous layer Hall effect (QALHE), can be realized in MnBi2Te4. The QALHE originates from kicking a layer-locked Berry-curvature monopole out of the Fermi sea by a vertielectric cal field. Remarkably, we demonstrate that the electric-field reversal can switch the sign of the quantized Hall conductance of QALHE in the even-layered AFM phase. The QALHE can also be realized in the ferromagnetic phase. These results provide a promising way toward the electric engineering of the Berry curvature monopoles and quantized-layered transport in topological magnets.
