Simin Nie

All Publications

• Magnetic Weyl Semimetal in K_{2}Mn_{3}(AsO_{4})_{3} with the Minimum Number of Weyl Points. Physical review letters Nie, S., Hashimoto, T., Prinz, F. B. 2022; 128 (17): 176401

  Abstract

  The "hydrogen atom" of magnetic Weyl semimetals, with the minimum number of Weyl points, has received growing attention recently due to the possible presence of Weyl-related phenomena. Here, we report a nontrivial electronic structure of the ferromagnetic alluaudite-type compound K_{2}Mn_{3}(AsO_{4})_{3}. Itexhibits only a pair of Weyl points constrained in the z direction by the twofold rotation symmetry, leading to extremely long Fermi arc surface states. In addition, the study of its low-energy effective model results in the discovery of various topological superconducting states, such as the hydrogen atom of a Weyl superconductor. Our Letter provides a feasible platform to explore the intrinsic properties related to Weyl points, and the related device applications.

  View details for DOI 10.1103/PhysRevLett.128.176401

  View details for PubMedID 35570444

• Magnetic Semimetals and Quantized Anomalous Hall Effect in EuB_{6}. Physical review letters Nie, S. n., Sun, Y. n., Prinz, F. B., Wang, Z. n., Weng, H. n., Fang, Z. n., Dai, X. n. 2020; 124 (7): 076403

  Abstract

  Exploration of the novel relationship between magnetic order and topological semimetals has received enormous interest in a wide range of both fundamental and applied research. Here we predict that "soft" ferromagnetic material EuB_{6} can achieve multiple topological semimetal phases by simply tuning the direction of the magnetic moment. Explicitly, EuB_{6} is a topological nodal-line semimetal when the moment is aligned along the [001] direction, and it evolves into a Weyl semimetal with three pairs of Weyl points by rotating the moment to the [111] direction. Interestingly, we identify a composite semimetal phase featuring the coexistence of a nodal line and Weyl points with the moment in the [110] direction. Topological surface states and anomalous Hall conductivity, which are sensitive to the magnetic order, have been computed and are expected to be experimentally observable. Large-Chern-number quantum anomalous Hall effect can be realized in its [111]-oriented quantum-well structures.

  View details for DOI 10.1103/PhysRevLett.124.076403

  View details for PubMedID 32142316

• Topological nodal-line semimetals in ferromagnetic rare-earth-metal monohalides PHYSICAL REVIEW B Nie, S., Weng, H., Prinz, F. B. 2019; 99 (3)

  View details for DOI 10.1103/PhysRevB.99.035125

  View details for Web of Science ID 000455823600002

• Dirac semimetal in type-IV magnetic space groups PHYSICAL REVIEW B Hua, G., Nie, S., Song, Z., Yu, R., Xu, G., Yao, K. 2018; 98 (20)

  View details for DOI 10.1103/PhysRevB.98.201116

  View details for Web of Science ID 000452002100001

• Topological phases in the TaSe3 compound PHYSICAL REVIEW B Nie, S., Xing, L., Jin, R., Xie, W., Wang, Z., Prinz, F. B. 2018; 98 (12)

  View details for DOI 10.1103/PhysRevB.98.125143

  View details for Web of Science ID 000445726500004

• Topological semimetal in honeycomb lattice LnSI PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Nie, S., Xu, G., Prinz, F. B., Zhang, S. 2017; 114: 10596

  Abstract

  Recognized as elementary particles in the standard model, Weyl fermions in condensed matter have received growing attention. However, most of the previously reported Weyl semimetals exhibit rather complicated electronic structures that, in turn, may have raised questions regarding the underlying physics. Here, we report promising topological phases that can be realized in specific honeycomb lattices, including ideal Weyl semimetal structures, 3D strong topological insulators, and nodal-line semimetal configurations. In particular, we highlight a semimetal featuring both Weyl nodes and nodal lines. Guided by this model, we showed that GdSI, the long-perceived ideal Weyl semimetal, has two pairs of Weyl nodes residing at the Fermi level and that LuSI (YSI) is a 3D strong topological insulator with the right-handed helical surface states. Our work provides a mechanism to study topological semimetals and proposes a platform for exploring the physics of Weyl semimetals as well as related device designs.

  View details for DOI 10.1073/pnas.1713261114

  View details for PubMedCentralID PMC5635928