Fermi point

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The term Fermi point has two applications but refers to the same phenomena (special relativity):

For both applications count that the symmetry between particles and anti-particles in weak interactions is violated:<br /><cite>At this point the particle energy E = cp is zero.</cite> An electron when as single particle is a Fermion obeying the Pauli exclusion principle.

Fermi point (Quantum Field Theory)

Fermionic systems that have a Fermi surface (FS) belong to a universality class in quantum field theory. <cite>Any collection of fermions with weak repulsive interactions belongs to this class.</cite> At the fermi point, the break of symmetry can be explained by assuming a vortex or singularity will appear as a result of the spin of a fermi particle (quasiparticle, Fermion) in one dimension of the three-dimensional momentum space.

Fermi point (Nanoscience)

The Fermi point is one particular electron state. The Fermi point refers to an event chirality of electrons is involved and the diameter of a carbon nanotube for which the nanotube becomes metallic. As the structure of a carbon nanotube determines the energy levels that the carbon's electrons may occupy, the structure...
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