Diracsemimetalen
Diracsemimetalen, also known as Dirac semimetals, are a class of quantum materials in which the conduction and valence bands touch at discrete points in momentum space. Around these points the electronic dispersion is linear, resembling the relativistic Dirac equation, and the quasiparticles behave as massless Dirac fermions. This linear dispersion results in high carrier mobility and unusual magneto‑transport phenomena such as large, non‑saturating magnetoresistance and the chiral anomaly. The crystal symmetry and time‑reversal invariance protect the Dirac points in many of these materials, which are typically found in three‑dimensional systems such as Na₃Bi, Cd₃As₂, and Bi₂Se₃ under specific conditions.
The discovery of Dirac semimetals began with theoretical predictions of 2D graphene and was extended to 3D
Research into Diracsemimetalen also links to adjacent fields such as Weyl semimetals and topological insulators, as