Metallic atomically-thin layered silicon epitaxially grown on silicene/ZrB2

作者：Gill Tobias G^*; Fleurence Antoine; Warner Ben; Pruser Henning; Friedlein Rainer; Sadowski Jerzy T; Hirjibehedin Cyrus F; Yamada Takamura Yukiko

来源：2D Materials, 2017, 4(2): 021015.

DOI：10.1088/2053-1583/aa5a80

• silicene
• scanning tunnelling microscopy (STM)
• low energy electron diffraction (LEED)
• silicon nanostructures

Using low energy electron diffraction (LEED) and scanning tunnelling microscopy (STM), we observe a new two-dimensional (2D) silicon crystal that is formed by depositing additional Si atoms onto spontaneously-formed epitaxial silicene on a ZrB2 thin film. From scanning tunnelling spectroscopy (STS) studies, we find that this atomically-thin layered silicon has distinctly different electronic properties. Angle resolved photoelectron spectroscopy (ARPES) reveals that, in sharp contrast to epitaxial silicene, the layered silicon exhibits significantly enhanced density of states at the Fermi level resulting from newly formed metallic bands. The 2D growth of this material could allow for direct contacting to the silicene surface and demonstrates the dramatic changes in electronic structure that can occur by the addition of even a single monolayer amount of material in 2D systems.

• 出版日期2017-6