Recent content by Newstein

Thank you so much!

I'm recently interested in the topological/Weyl semimetals, but I'm not an expert on the theory. Most papers just define Weyl semimetal as a material that have pairs of Weyl points with opposite Berry curvature. Here in graphene, the Berry curvature of the Dirac cones at K and K' point is also...

Consider a system with a mirror axis (bulk projected surface), I want to know the direction of spin polarization on the mirror axis. The result is that the spin is perpendicular to the mirror axis, but I don't understand the reason. If someone have related references, please recommend to me...

I have read many papers stating that the wave function of graphene has two components due to the fact that the unit cell of graphene consists of two carbon atoms (A and B atoms). However, I was confused about that. If the unit cell consist of more atoms, what will the wave function be? Does it...

Thank you! I think that what you said is right. Considering only the group theory, all K points are equivalent, whether in graphene or Ag(111). The inequivalence of K and K' in graphene might have its electronic origin. The problem I encountered is a √3 honeycomb reconstruction (structural...

Thank you, but I remember the BZ of both graphene and Ag(111) is a hexagon, identical to the honeycomb lattice of graphene in real space, while the lattice of Ag(111) in real space is the close packed structure. I want to know is the correlation of lattice in real space and the BZ, or does the...

The Brillouin Zone (BZ) of both graphene and the (111) surface of metals like Ag(111) eihibit a hexagon, but I wonder why the BZ of graphene has two inequivalent ponits K and K', while the K point of BZ of the Ag(111) is equivalent. Thank you in advance!