研究目的
Investigating the electronic properties of lead islands deposited on twisted graphene layers and their interaction with the graphene substrate.
研究成果
The lead islands grown on the surface of graphene can be considered as freestanding from the point of view of their electronic structure, leaving the surrounding graphene layer unperturbed. The transparency of the interface is good enough to induce superconductivity within the underlying graphene layer by proximity effect with the Pb islands.
研究不足
The study is limited by the temperature at which the measurements were taken (8.5 K), which is too high to address the question of proximity-induced superconducting gap in graphene. The sample temperature constraints the detection of superconductivity.
1：Experimental Design and Method Selection:
Scanning tunneling microscopy and spectroscopy were used to investigate the electronic properties of lead islands on graphene. Ab initio calculations were performed for comparison.
2：Sample Selection and Data Sources:
Lead islands were deposited by molecular beam epitaxy on twisted graphene layers grown on SiC(000-1).
3：1).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Home-built low temperature STM operating at 8.5 K, mechanically sharpened PtIr tip, homebuilt evaporator for lead deposition.
4：5 K, mechanically sharpened PtIr tip, homebuilt evaporator for lead deposition.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Lead was deposited in situ with a homebuilt evaporator at the rate 0.2 ML/min on the surface kept at room temperature. Spectroscopic measurements were performed with the standard lock-in technique.
5：2 ML/min on the surface kept at room temperature. Spectroscopic measurements were performed with the standard lock-in technique.
Data Analysis Methods:
5. Data Analysis Methods: Data analysis was performed with WSxM software. DFT calculations were performed using the VASP code with the projector-augmented wave approach.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
