Mapping The Phase Diagram Of The Quantum Anomalous Hall And Topological Hall Effects

What Has Been Achieved:

Developed dual-gated magnetic topological heterostructures that manifest both the quantum anomalous and topological Hall effects as a function of the dual-gate voltages.

Importance of the Achievement:

This work provides a robust pathway for producing samples that enable the fundamental study of the interplay between Berry curvature in momentum space and real space. These unique samples and patterned devices are available for users as sample requests.

Unique Feature(s) of the MIP that Enabled this Achievement:

2DCC-MIP’s synthesis capabilities of magnetically-doped topological insulator heterostructures.

Publication:

Run Xiao, Di Xiao, Jue Jiang, Jae-Ho Shin, Fei Wang, Yi-Fan Zhao, Ruo-Xi Zhang, Anthony Richardella, Ke Wang, Morteza Kayyalha, Moses H. W. Chan, Chao-Xing Liu, Cui-Zu Chang, and Nitin Samarth, Mapping the phase diagram of the quantum anomalous Hall and topological Hall effects in a dual-gated magnetic topological insulator heterostructure, Phys. Rev. Research 3, L032004

https://doi.org/10.1103/PhysRevResearch.3.L032004

The synthesis of samples was supported by the National Science Foundation (NSF) 2DCC-MIP (Grant No. DMR-1539916). The dilution electrical transport measurements were supported by Department of Energy (DOE) Grant No. DE-SC0019064, the Gordon and Betty Moore Foundation's EPiQS Initiative (Grant No. GBMF9063 to C.-Z.C.), and NSF (DMR-1707340). The electrical transport measurements >400 mK were supported by the Institute for Quantum Matter under DOE Energy Frontier Research Centers Grant No. DE-SC0019331. The theoretical calculations were also supported by DOE Grant No. DE-SC0019064.