Why perfect graphene has nonmagnetic state?

[Hyeonyeong Kim]

I'm major in chemistry my undergraduate.. and not good at Physics, Solid states... etc.

I know pure graphene has two sub-lattice because it has two carbon atoms.. and something basic properties.

then, why perfect graphene(no vacancy) is in nonmagnetic?

 

[DrDu]

Already its Lewis structure should tell you that all electrons are paired. So why do you expect it to be magnetic?

 

[Hyeonyeong Kim]

yes.. that is reasonable.

when I saw the electronic band structure, I could see fermi level does not put on any state.

it say there is not unpaired electron. sorry. I think I had to post more better question.Actually I want to know, when graphene has two vacancy, graphene can get the two vacancy configuration.

1. same sublattice, 2. different sublattice.

I knew there magnetic trend..
1 : ferromagnetic state
2 : nonmagnetic state

I couldn't understand in case of 2, why graphene can get more low total energy?In case of 2, I thought my question has something relation with my first question. that is my mistake.

sorry for my low english level.

 

[DrDu]

In case 2 you can draw a Lewis structure where all electrons are paired up, in cade 1 you cannot but get a diradical which by Hund's rule will be a triplet, i.e. ferromagnetic.