论文标题
二维拓扑抗铁磁铁边缘的螺旋luttinger液体
Helical Luttinger liquid on the edge of a 2-dimensional topological antiferromagnet
论文作者
论文摘要
边界螺旋Luttinger液体（HLL）具有破碎的体积反转对称性，属于抗铁磁铁（AFM）中可能发生的独特拓扑类别。在这里，我们在最近发现的拓扑AFM MNBI2TE4偶数层的边缘搜索HLL的签名。使用扫描超导量子干扰装置，我们直接在AFM基态中的螺旋边缘电流出现在其电荷中性点处。这种螺旋边缘状态伴随着一个绝缘的散装，在磁场驱动的量子相变中显示，在拓扑上与铁磁切绝缘子相截然不同。 AFM订单的边缘电导遵循幂律作为温度和源含量偏置的函数，这是HLL的有力证据。在量子临界点以下的有限场上，这种HLL缩放率很强。分层的AFM半导体中观察到的HLL代表与未来的Spintronics和量子计算兼容的高度可调的拓扑问题。
Boundary helical Luttinger liquid (HLL) with broken bulk time-reversal symmetry belongs to a unique topological class which may occur in antiferromagnets (AFM). Here, we search for signatures of HLL on the edge of a recently discovered topological AFM, MnBi2Te4 even-layer. Using scanning superconducting quantum interference device, we directly image helical edge current in the AFM ground state appearing at its charge neutral point. Such helical edge state accompanies an insulating bulk which is topologically distinct from the ferromagnetic Chern insulator phase as revealed in a magnetic field driven quantum phase transition. The edge conductance of the AFM order follows a power-law as a function of temperature and source-drain bias which serves as strong evidence for HLL. Such HLL scaling is robust at finite fields below the quantum critical point. The observed HLL in a layered AFM semiconductor represents a highly tunable topological matter compatible with future spintronics and quantum computation.
