I have a question about definition of charge neutral point. I`m reading some article about trilayer graphene, and this term, charge neutral point, is used in the article. I googling this word, but I can`t find something which can tell me what it is. In monolayer graphene, what i found by searching, it is equal to dirac point. But In trilayer there is no dirac point and it has some bandgap. What is the carge neutral point in this?????