"Molecular beam epitaxial growth of a three-dimensional topological Dirac semimetal Na3Bi "

Yi Zhang: Zhongkai Liu, Bo Zhou, Yeongkwan Kim, Zahid Hussain, Zhi-Xun Shen, Yulin Chen and Sung-Kwan Mo; Applied Physics Letters, 07/21/14.

Additional Authors: Zhongkai Liu, Bo Zhou, Yeongkwan Kim, Zahid Hussain, Zhi-Xun Shen, Yulin Chen and Sung-Kwan Mo

Abstract:

We report a molecular beam epitaxial growth of Na Bi single-crystal thin films on two different substrates—epitaxial bilayer graphene terminated 6H-SiC(0001) and Si(111). Using reflection high-energy electron diffraction, we found that the lattice orientation of the grown Na Bi thin film was rotated by 30° respect to the surface lattice orientations of these two substrates. An angle-resolved photoemission spectroscopy clearly revealed the 3-dimensional Dirac-cone band structure in such thin films. Our approach of growing Na Bi thin film provides a potential route for further studying its intriguing electronic properties and for fabricating it into practical devices in future.