Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5357584 | Applied Surface Science | 2015 | 5 Pages |
Abstract
Three-dimensional (3D) Dirac cones are predicted to reside in semimetals A3Bi (AÂ =Â Na, K). By using molecular beam epitaxy (MBE) and scanning tunneling microscopy (STM), we have successfully established the growth conditions for Na3Bi thin films on Si(1Â 1Â 1)-7Â ÃÂ 7, and determined that the lattice of Na3Bi is rotated by 30 degree with respect to that of Si(1Â 1Â 1)-7Â ÃÂ 7. The Na3Bi/Si(1Â 1Â 1)-7Â ÃÂ 7 thin film was further used as the substrate for the growth of K3Bi. The 3D Dirac-cone-like electronic band structures of Na3Bi and K3Bi have been clearly revealed by angle resolved photoelectron spectroscopy (ARPES).
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Authors
Jing Wen, Hua Guo, Chen-Hui Yan, Zhen-Yu Wang, Kai Chang, Peng Deng, Teng Zhang, Zhi-Dong Zhang, Shuai-Hua Ji, Li-Li Wang, Ke He, Xu-Cun Ma, Xi Chen, Qi-Kun Xue,