Effects of Domain Walls in Quantum Anomalous Hall Insulator/Superconductor Heterostructures

Abstract

In a recent experiment, half-quantized longitudinal conductance plateaus (HQCPs) of height $\frac{e^2}{2h}$ have been observed in quantum anomalous Hall (QAH) insulator/superconductor heterostructure transport measurements. It was predicted that these HQCPs are signatures of chiral Majorana edge states. The HQCPs are supposed to appear in the regimes where the Hall conductance ${\sigma }_{xy}$ is quantized. However, experimentally, a pair of the HQCPs appear when the Hall conductance ${\sigma }_{xy}$ is only 80% of the quantized value when dissipative channels appear in the bulk. The dissipative channels in the bulk are expected to induce Andreev reflections and ruin the HQCPs. In this work, we explain how domain walls can cause ${\sigma }_{xy}$ to deviate from its quantized value and at the same time maintain the quantization of HQCPs. Our work supports the claim that the experimentally observed HQCPs are indeed caused by chiral Majorana modes in the QAH insulator/superconductor heterostructure.

5 pages, 3 figures. Comments are welcome

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Cited by in corpus (22)

• Colloquium: Quantum anomalous Hall effect
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• Disorder-induced half-integer quantized conductance plateau in quantum anomalous Hall insulator-superconductor structures
• Quasi-one-dimensional Quantum Anomalous Hall Systems as New Platforms for Scalable Topological Quantum Computation
• Electrical probes of the non-Abelian spin liquid in Kitaev materials
• Effects of random domains on the zero Hall plateau in quantum anomalous Hall effect
• Photoinduced $\frac{1}{2}\frac{e^2}{h}$ and $\frac{3}{2}\frac{e^2}{h}$ conductance plateaus in topological insulator-superconductor heterostructures
• Platform of chiral Majorana edge modes and its quantum transport phenomena
• Noise signatures for determining chiral Majorana fermion modes
• Chiral Majorana fermion modes regulated by a scanning tunneling microscope tip
• Emergent Josephson current of $N=1$ chiral topological superconductor in quantum anomalous Hall insulator/superconductor heterostructures
• Volkov-Pankratov states in topological superconductors
• Vortex Lattice Structure and Topological Superconductivity in the Quantum Hall Regime
• Spin-triplet superconductor$-$quantum anomalous Hall insulator$-$spin-triplet superconductor Josephson junctions: $0$-$\pi$ transition, ${\varphi }_0$ phase and switch effects
• Configuration-Sensitive Transport on Domain Walls of a Magnetic Topological Insulator
• Phase transitions in intrinsic magnetic topological insulator with high-frequency pumping
• Robust Majorana bound states in magnetic topological insulator nanoribbons with fragile chiral edge channels
• Chiral edge state coupling theory of transport in quantum anomalous Hall insulators
• Inducing superconductivity in quantum anomalous Hall regime
• Quantum computation at the edge of a disordered Kitaev honeycomb lattice
• AC anomalous Hall effect in topological insulator Josephson junctions
• Laughlin charge pumping from interplay of chiral Dirac and chiral Majorana modes