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Controllable and Continuous Quantum Phase Transitions in Intrinsic Magnetic Topological Insulator by Xu, Shengjie; Shi, Zhijian; Yang, Ming; Zhang, Jingwei; Xu, Hang; Feng, Haifeng; Cheng, Ningyan; Wang, Jianfeng; Hao, Weichang; Du, Yi is a scholarly article available to read on EtoBox.

What is Controllable and Continuous Quantum Phase Transitions in Intrinsic Magnetic Topological Insulator about?

The intrinsic magnetic topological material MnBi2Te4 has demonstrated great potential to investigate the interplay between topology and magnetism, which opens up new avenues for manipulating non-trivial electronic states and designing quantum devices. However, challenges and controversies remain due to its inevitable n-type antisite defects, hindering the experimental realization of intrinsic magnetic topological phenomena and rendering the precise control of topological phase transitions (TPTs) unachievable. Here, we study a candidate material family, Mn(1-x)GexBi2Te4, in which the heavy n-type doping features are strongly suppressed when the Ge content reaches 0.46, and multiple topological phases are well maintained with the surface Dirac point located near the Fermi level. Based on angle-resolved photoemission spectroscopy, transport measurements, and first-principles calculations, we reveal two magnetism-induced TPTs: the first is antiferromagnetic-ordering-induced transition from strong topological insulator to a magnetic topological insulator as revealed by gap opening of topological surface states; the second is external-magnetic-field-dependent transition from magnetic top

Author

Xu, Shengjie; Shi, Zhijian; Yang, Ming; Zhang, Jingwei; Xu, Hang; Feng, Haifeng; Cheng, Ningyan; Wang, Jianfeng; Hao, Weichang; Du, Yi

Published

2025

Language

EN