Quantum anomalous Hall multilayers grown by molecular beam epitaxy

Abstract

Quantum anomalous Hall (QAH) effect is a quantum Hall effect that occurs without the need of external magnetic field. A system composed of multiple parallel QAH layers is an effective high Chern number QAH insulator and the key to the applications of the dissipationless chiral edge channels in low energy consumption electronics. Such a QAH multilayer can also be engineered into other exotic topological phases such as a magnetic Weyl semimetal with only one pair of Weyl points. This work reports the first experimental realization of QAH multilayers in the superlattices composed of magnetically doped (Bi,Sb)${}_2$Te${}_3$ topological insulator and CdSe normal insulator layers grown by molecular beam epitaxy. The obtained multilayer samples show quantized Hall resistance $h/Ne$${}^2$, where $h$ is the Planck's constant, $e$ is the elementary charge and $N$ is the number of the magnetic topological insulator layers, resembling a high Chern number QAH insulator.

9 pages, 3 figures

References in corpus (5)

• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
• Trajectory of Anomalous Hall Effect toward the Quantized State in a Ferromagnetic Topological Insulator
• Scale-Invariant Dissipationless Chiral Transport in Magnetic Topological Insulators beyond the Two-Dimensional Limit
• Giant Anisotropic Magnetoresistance in a Quantum Anomalous Hall Insulator

Cited by in corpus (12)

• Colloquium: Quantum anomalous Hall effect
• Tuning Chern Number in Quantum Anomalous Hall Insulators
• Progress and prospects in the quantum anomalous Hall effect
• Hinged Quantum Spin-Hall Effect in Antiferromagnetic Topological Insulators
• Multiple Chiral Majorana Fermion Modes and Quantum Transport
• Nano-mosaic of Topological Dirac States on the Surface of Pb5Bi24Se41 Observed by Nano-ARPES
• Fractional AC Josephson effect in a topological insulator proximitized by a self-formed superconductor
• Magnetic Proximity Effect in an Antiferromagnetic Insulator/Topological Insulator Heterostructure with Sharp Interface
• Disorder-Induced Topological Transitions in a Multilayer Topological Insulator
• Distribution of Conductances in Chiral Topological Superconductor Junctions
• Topological Insulators-Based Magnetic Heterostructure
• Localization Trajectory and Chern-Simons axion coupling for Bilayer Quantum Anomalous Hall Systems