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I Why perfect graphene has nonmagnetic state?

  1. Feb 15, 2017 #1
    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?
     
  2. jcsd
  3. Feb 15, 2017 #2

    DrDu

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    Already its Lewis structure should tell you that all electrons are paired. So why do you expect it to be magnetic?
     
  4. Feb 15, 2017 #3
    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.
     
  5. Feb 16, 2017 #4

    DrDu

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    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.
     
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