Synthesis of semimetal a 3 Bi (A = Na, K) thin films by molecular beam epitaxy

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Three-dimensional (3D) Dirac cones are predicted to reside in semimetals A 3 Bi (A = Na, K). By using molecular beam epitaxy (MBE) and scanning tunneling microscopy (STM), we have successfully established the growth conditions for Na 3 Bi thin films on Si(1 1 1)-7 x 7, and determined that the lattice of Na 3 Bi is rotated by 30 degree with respect to that of Si(1 1 1)-7 x 7. The Na3Bi/Si(1 1 1)-7 x 7 thin film was further used as the substrate for the growth of K 3 Bi. The 3D Dirac-cone-like electronic band structures of Na 3 Bi and K 3 Bi have been clearly revealed by angle resolved photoelectron spectroscopy (ARPES).

Original languageEnglish
Pages (from-to)213-217
Number of pages5
JournalApplied Surface Science
Volume327
DOIs
Publication statusPublished - 1 Feb 2015
Externally publishedYes

Keywords

  • ARPES
  • K Bi
  • MBE
  • Na Bi
  • STM

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