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Noguchi E.,Tohoku University | Sugawara K.,Tohoku University | Yaokawa R.,Toyota Central R AndD Labs. Inc. Nagakute | Hitosugi T.,Tohoku University | And 4 more authors.
Advanced Materials | Year: 2015

Results of high-resolution angle-resolved photoemission spectroscopy (ARPES) on tr3-CaSi2 which has the ABC stacking-sequence (tr3) of both Ca and silicene layers along the [0001] crystal axis per unit cell, was reported. In the ARPES-derived band structure, it is observed that the massless Dirac-cone π-electron dispersions at the K(H) point in the Brillouin zone, together with the ω-band dispersions. The Dirac point is located about 2 eV from Fermi level, showing a substantial charge transfer from Ca atoms to silicene layers. The present ARPES results indicate that the sp2 bonding-framework essentially holds in CaSi2 to produce the massless Dirac-cone state at the K point despite the strongly buckled structure in silicene layer.

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