Controllable and Continuous Quantum Phase Transitions in Intrinsic Magnetic Topological Insulator
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866929748518633472 |
|---|---|
| author | Xu, Shengjie Shi, Zhijian Yang, Ming Zhang, Jingwei Xu, Hang Feng, Haifeng Cheng, Ningyan Wang, Jianfeng Hao, Weichang Du, Yi |
| author_facet | Xu, Shengjie Shi, Zhijian Yang, Ming Zhang, Jingwei Xu, Hang Feng, Haifeng Cheng, Ningyan Wang, Jianfeng Hao, Weichang Du, Yi |
| contents | 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 topological insulator to a Weyl semimetal with the gap reclosed. Our work paves the way for the realization of intrinsic magnetic topological states in MnBi2Te4 family and provides an ideal platform for achieving controllable and continuous TPTs towards future spintronic applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_06044 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Controllable and Continuous Quantum Phase Transitions in Intrinsic Magnetic Topological Insulator Xu, Shengjie Shi, Zhijian Yang, Ming Zhang, Jingwei Xu, Hang Feng, Haifeng Cheng, Ningyan Wang, Jianfeng Hao, Weichang Du, Yi Materials Science Other Condensed Matter Quantum Physics 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 topological insulator to a Weyl semimetal with the gap reclosed. Our work paves the way for the realization of intrinsic magnetic topological states in MnBi2Te4 family and provides an ideal platform for achieving controllable and continuous TPTs towards future spintronic applications. |
| title | Controllable and Continuous Quantum Phase Transitions in Intrinsic Magnetic Topological Insulator |
| topic | Materials Science Other Condensed Matter Quantum Physics |
| url | https://arxiv.org/abs/2503.06044 |