Emergence of Fermi arcs and novel magnetic splitting in an antiferromagnet

Understand

The Fermi arcs are signatures of exotic states in solids because they defy conventional concept of Fermi surfaces as closed contours in momentum space.

• Fermi arcs were first discovered in cuprates, and caused by the pseudogap.
• Weyl semimetals provided another way to generate Fermi arcs by breaking either the time reversal symmetry (TRS) or inversion symmetry of a 3D Dirac semimetal, which can result in a Weyl semimetal with pairs of Weyl nodes that have opposite chirality.
• The bulk-boundary correspondence associated with the Chern number leads to the emergence of Fermi arcs on the boundary.