The Fermi point refers to a specific concept related to the behavior of quasi-particles in certain condensed matter systems, particularly in the context of topological materials and the study of fermionic systems. To understand the Fermi point, we can relate it to a few important concepts in solid-state physics and quantum field theory. 1. **Fermi Energy**: In solid-state physics, the Fermi energy is the highest energy level that electrons occupy at absolute zero temperature in a solid.
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A Fermi point is a point of the zero-temperature Fermi surface in one-dimensional momentum space. For a spin-degenerate band with one occupied interval, its two boundaries are usually and . Low-energy excitations near them form left- and right-moving branches. A perturbation at wavevector can mix those branches, as in a Peierls distortion.