Quantum anomalous Hall edge channels survive up to the Curie temperature

Fijalkowski, Kajetan M.; Liu, Nan; Mandal, Pankaj; Schreyeck, S.; Βrunner, Karl; Gould, C.; Molenkamp, Laurens W.

doi:10.1038/s41467-021-25912-w

Cited by 25 publications

(11 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A detailed transport study provides strong evidences to show that the nonequilibrium current flows primarily through the two-dimensional bulk of the QAH insulator rather than, as had been previously assumed, through the edges [19]. Consistently, it further shows that the transport in the QAH insulator of the Corbino geometry in a previous study [20] can be described by the solution to Laplace equation, which demonstrates a spatially-uniform conductivity (i.e. the current propagates uniformly through the entire system) rather than the bulk-boundary correspondence.…”

Section: Introductionsupporting

confidence: 81%

Probing the percolation in the quantum anomalous Hall insulator

Huang²,

Sun³

et al. 2023

New J. Phys.

View full text Add to dashboard Cite

The percolation plays an essential role in the physics of plateau transition, localization, and breakdown in quantum Hall (QH) systems. In practice, it always exists probably due to sample imperfections and has to be addressed before realizing the full potentials of topological electronics and qubits. Here, we investigate the cause, distribution, and number of the percolation in a quantum anomalous Hall (QAH) insulator of an anti-Hall bar geometry with two perimeters, which allows for probing both the inter- and intra-perimeter percolations by injecting currents into either or both perimeters. We discover the dual-QAH effect with opposite chiralities from these two perimeters, which exhibits linear modulations by the currents applied to both perimeters. By solving the formulation of such modulations with the Landauer–Büttiker formalism, the distribution and number of the inter-perimeter percolative channels could be identified. Strikingly, a dissipative constituent is detected in the transport of the QAH state, as revealed by the linear scalings in longitudinal conductivities versus the sum of currents injected to both perimeters, similar to that in the trivial-insulating state. Such a behavior unveils the quasi-2D nature of the intra-perimeter percolation, which superimposes onto and perturbs the dissipationless chiral edge transport. The formation of percolations is ascribed to the joint effect of the electric field, finite conductivity, and sample imperfections.

show abstract

Section: Introductionsupporting

confidence: 81%

Probing the percolation in the quantum anomalous Hall insulator

Huang²,

Sun³

et al. 2023

New J. Phys.

View full text Add to dashboard Cite

show abstract

“…It was also found that thermally activated bulk conductance was mostly responsible for quantization breakdown. 429 These results show promise on the availability of topological protection from MTI edge channels for developing a resistance standard.…”

Section: Quantum Anomalous Hall Effect Inmentioning

confidence: 87%

“…One of the last remaining limitations to be lifted are the stringent temperature requirements, which are currently in the 10 to 100 mK range. Fijalkowski et al 429 show that the chiral edge channels associated with the QAHE continue to exist without applied magnetic field up to the Curie temperature (about 20 K) of bulk ferromagnetism in their TI system. This conclusion was reached through a careful analysis of nonlocal voltages in Corbino-type devices.…”

Section: Quantum Anomalous Hall Effect Inmentioning

confidence: 99%

Recent Advances in 2D Material Theory, Synthesis, Properties, and Applications

et al. 2023

View full text Add to dashboard Cite

Two-dimensional (2D) material research is rapidly evolving to broaden the spectrum of emergent 2D systems. Here, we review recent advances in the theory, synthesis, characterization, device, and quantum physics of 2D materials and their heterostructures. First, we shed insight into modeling of defects and intercalants, focusing on their formation pathways and strategic functionalities. We also review machine learning for synthesis and sensing applications of 2D materials. In addition, we highlight important development in the synthesis, processing, and characterization of various 2D materials (e.g., MXnenes, magnetic compounds, epitaxial layers, low-symmetry crystals, etc.) and discuss oxidation and strain gradient engineering in 2D materials. Next, we discuss the optical and phonon properties of 2D materials controlled by material inhomogeneity and give examples of multidimensional imaging and biosensing equipped with machine learning analysis based on 2D platforms. We then provide updates on mix-dimensional heterostructures using 2D building blocks for next-generation logic/memory devices and the quantum anomalous Hall devices of high-quality magnetic topological insulators, followed by advances in small twist-angle homojunctions and their exciting quantum transport. Finally, we provide the perspectives and future work on several topics mentioned in this review.

show abstract

“…Note added: After submission, we became aware of the work by Fijalkowski et al reporting nonlocal transport measurements on V-doped (Bi x Sb 1−x ) 2 Te 3 in multiterminal Corbino devices [41].…”

Section: Discussionmentioning

confidence: 99%

Current-induced breakdown of the quantum anomalous Hall effect

et al. 2022

View full text Add to dashboard Cite

The quantum anomalous Hall effect (QAHE) realizes dissipationless longitudinal resistivity and quantized Hall resistance without the need of an external magnetic field. However, when reducing the device dimensions or increasing the current density, an abrupt breakdown of the dissipationless state occurs with a relatively small critical current, limiting the applications of the QAHE. We investigate the mechanism of this breakdown by studying multi-terminal devices and identified that the electric field created between opposing chiral edge states lies at the origin. We propose that electric-field-driven percolation of two-dimensional charge puddles in the gapped surface states of compensated topological-insulator films is the most likely cause of the breakdown.

show abstract

Quantum anomalous Hall edge channels survive up to the Curie temperature

Cited by 25 publications

References 29 publications

Probing the percolation in the quantum anomalous Hall insulator

Probing the percolation in the quantum anomalous Hall insulator

Recent Advances in 2D Material Theory, Synthesis, Properties, and Applications

Current-induced breakdown of the quantum anomalous Hall effect

Contact Info

Product

Resources

About