In the field of
unconventional superconductivity, a Fermi arc is a phenomenon visible in the
pseudogap state of a superconductor. Seen in momentum space, part of the space exhibits a gap in the density of states, like in a superconductor. This starts at the antinodal points, and spreads through momentum space when lowering the temperature until everywhere is gapped and the sample is superconducting. The area in momentum space that remains ungapped is called the Fermi Arc.
Fermi arcs also appear in some materials with topological properties such as
Weyl Semimetals where they represent a surface projection of a two dimensional Fermi contour and are terminated onto the projections of the Weyl fermion nodes on the surface.
See also
*
Fermi surface In condensed matter physics, the Fermi surface is the surface in reciprocal space which separates occupied from unoccupied electron states at zero temperature. The shape of the Fermi surface is derived from the periodicity and symmetry of the crys ...
References
Superconductivity
{{Condensedmatter-stub