Weyl semimetals (WSMs) are three-dimensional topological materials that exhibit fascinating properties due to the presence of Weyl nodes in their band structure. However, existing WSMs discovered so far often possess multiple pairs of Weyl nodes, posing a challenge in disentangling the contributions to transport phenomena from different energy bands. To overcome this challenge, we have identified field-induced ferromagnetic MnBi2−xSbxTe4 as an ideal type-II WSM with a single pair of Weyl nodes. By employing a combination of quantum oscillations and high-field Hall measurements, we have resolved the evolution of Fermi-surface sections as the Fermi level is tuned across the charge neutrality point, precisely matching the band structure of an ideal type-II WSM. Furthermore, the anomalous Hall conductivity exhibits a heartbeat-like behavior as the Fermi level is tuned across the Weyl nodes, a unique feature previously predicted for a type-II WSM. Our findings establish MnBi2−xSbxTe4 as an ideal platform for further investigation into Weyl physics.
@article{arxiv.2306.08339,
title = {Fermi Surface Evolution and Anomalous Hall Effect in an Ideal Type-II Weyl Semimetal},
author = {Qianni Jiang and Johanna C. Palmstrom and John Singleton and Shalinee Chikara and David Graf and Chong Wang and Yue Shi and Paul Malinowski and Aaron Wang and Zhong Lin and Lingnan Shen and Xiaodong Xu and Di Xiao and Jiun-Haw Chu},
journal= {arXiv preprint arXiv:2306.08339},
year = {2023}
}