DFT calculations indicate the rhombohedral β-Cu₂Se is a Dirac semimetal with bulk Dirac points protecting surface Fermi arc states.
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Dirac Semimetal Phase in Rhombohedral $\beta -$Cu$_{2}$Se
DFT calculations indicate the rhombohedral β-Cu₂Se is a Dirac semimetal with bulk Dirac points protecting surface Fermi arc states.