Mesoscopic Transport of Quantum Anomalous Hall Effect in Sub-Micron Size Regime

Abstract

The quantum anomalous Hall (QAH) effect has been demonstrated in two-dimensional topological insulator systems incorporated with ferromagnetism. However, a comprehensive understanding of mesoscopic transport in sub-micron QAH devices has yet been established. Here we fabricated miniaturized QAH devices with channel widths down to 600 nm, where the QAH features are still preserved. A back-scattering channel is formed in narrow QAH devices through percolative hopping between 2D compressible puddles. Large resistance fluctuations are observed in narrow devices near the coercive field, which is associated with collective interference between intersecting paths along domain walls when the device geometry is smaller than the phase coherence length $L_{\varphi }$. Through measurement of size-dependent breakdown current, we confirmed that the chiral edge states are confined at the physical boundary with its width on the order of Fermi wavelength.

arXiv comment7 pages, 5 figures

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• Implementing Microwave Impedance Microscopy in a Dilution Refrigerator
• Macroscopic Quantum Tunneling of a Topological Ferromagnet
• Low-energy modeling of three-dimensional topological insulator nanostructures
• Chiral edge state coupling theory of transport in quantum anomalous Hall insulators
• Optimizing proximitized magnetic topological insulator nanoribbons for Majorana bound states
• Chern junctions in Moiré-Patterned Graphene/PbI2
• Electrostatic gating and the interference of chiral Majoranas in thin slabs of magnetic topological insulators