Possible three-dimensional all-sp~2 phases of carbon with edge states

摘要

We discuss a possibility of new three-dimensional all-sp~2 phases of carbon. The most interesting property of them is appearance of special surface states, i.e. the edge states. One of characters of edge states is large degeneracy at the Fermi level. Thus, these structures are expected to be metallic carbon-materials. In this paper, we show #pi#-band structure and band structure based on the first principle calculation within local density approximation(LDA).