Question

Are Dirac points the norm for 2D band structure?

Answer 1

Hey mate.....

here's Ur answer......

Dirac points are the norms of band structure because they are related.

As in shallow lattices I noticed that there is a presence of typical points on the edges of where lowest bands are approximately touching.

Hope it Helps

Be brainly....

Answer 2

The Dirac point is the crossingpoint of the linear energy dispersion curves E_+(k)=+ v_F.k, E_-(k) =-v_F.k . Because of two sublattices of graphene, there exist two symmetric Dirac points, - K, +K. The energy at the crossing points is zero, therefore graphene is gapless and so it is a semimetal.