研究目的
To experimentally realize a 2D system composed of a tin overlayer on an aluminum substrate by molecular beam epitaxy and to investigate its electronic and topological properties.
研究成果
The experimental confirmation of 2D Lieb lattices promotes our understanding of their symmetry-related electronic and topological properties for the exploration of novel physical properties and applications. The study provides an appealing way to search for novel 2D quantum materials and tune their electronic and topological properties by regulating the symmetry and the interaction between the crystal lattice and the substrate.
研究不足
The study is limited by the structural instability of the Lieb lattice and the need for a suitable substrate to stabilize the lattice. The electronic structure is also influenced by the interaction with the substrate, which may mask some of the intrinsic properties of the Lieb lattice.
1：Experimental Design and Method Selection:
Molecular beam epitaxy (MBE) was used to grow a tin overlayer on an aluminum substrate. Theoretical calculations were performed to predict the electronic band structure and topological properties of the system.
2：Sample Selection and Data Sources:
The Al(100) substrate was prepared by cycles of Ar+ sputtering and annealing. Sn was deposited on the cleaned Al(100) surface by evaporation.
3：List of Experimental Equipment and Materials:
Scanning tunneling microscopy (STM), angle-resolved photoemission spectroscopy (ARPES), low-energy electron diffraction (LEED), and a home-built Ta crucible for Sn evaporation.
4：Experimental Procedures and Operational Workflow:
The growth rate of Sn was calibrated by the growth of Sn on Ag(111) substrate. STM was performed at 80 K. ARPES and LEED characterizations were carried out at Beamline 4B9B in the Beijing Synchrotron Radiation Facility (BSRF).
5：Data Analysis Methods:
DFT calculations were performed with the Vienna ab initio simulation package. The STM images were analyzed using WSxM software.
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