Wallpaper fermions and the nonsymmorphic Dirac insulator
Abstract
Analyzing the spatial symmetries of three-dimensional (3D) crystal structures has led to the discovery of exotic types of quasiparticles and topologically nontrivial materials. Wieder et al. focus on the symmetry groups of 2D surfaces of 3D materials—the so-called wallpaper groups—and find that some of them allow for an additional topological class. This class hosts a single fourfold-degenerate Dirac fermion on the surface of the material and, on the basis of the authors' calculations, is expected to occur in the compound Sr 2 Pb 3 .
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 20, 2018
- Source ID
- 10.1126/science.aan2802
Entities
People
- Andrei Bernevig
- Andrew M Rappe
- Barry Bradlyn
- Benjamin J. Wieder
- Charles L. Kane
- Hyeong-Seok D Kim
- Jennifer Cano
- Youngkuk Kim
- Zhijun Wang
Organizations
- Army Research Office
- David and Lucile Packard Foundation
- European Research Council
- Freie Universität Berlin
- Max Planck Institute for Microstructure Physics
- National Natural Science Foundation of China
- National Science Foundation
- Nordic Institute for Theoretical Physics
- Princeton University
- Simons Foundation
- Sungkyunkwan University
- United States Department of Defense
- United States Department of Energy
- University of Pennsylvania