2016/10/31 by Y. X. Zhao, Y. Lu · 2 citations
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.mtrl-sci #cond-mat.quant-gas
paper · pdf · doi:10.1103/physrevlett.118.056401
published as Phys. Rev. Lett. 118, 056401 (2017) · 7.5 pages, 5 figures. Accepted by Phys. Rev. Lett
arxiv created 2017/01/16 · arxiv updated 2017/02/03
Recently Weyl fermions have attracted increasing interest in condensed matter physics due to their rich phenomenology originated from their nontrivial monopole charges. Here we present a theory of real Dirac points that can be understood as real monopoles in momentum space, serving as a real generalization of Weyl fermions with the reality being endowed by the PT symmetry. The real counterparts of topological features of Weyl semimetals, such as Nielsen-Ninomiya no-go theorem, 2D sub topological insulators and Fermi arcs, are studied in the PT symmetric Dirac semimetals, and the underlying reality-dependent topological structures are discussed. In particular, we construct a minimal model of the real Dirac semimetals based on recently proposed cold atom experiments and quantum materials about PT symmetric Dirac nodal line semimetals.