Wang Jing, Bagheri Tagani Meysam, Zhang Li, Xia Yu, Wu Qilong, Li Bo, Tian Yuan, Yin Long-Jing, Zhang Lijie, Qin Zhihui
Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China.
Department of Physics, University of Guilan, PO Box, 41335-1914 Rasht, Iran.
J Phys Condens Matter. 2023 Sep 5;35(48). doi: 10.1088/1361-648X/acf107.
Lead selenide (PbSe) has been attracted a lot attention in fundamental research and industrial applications due to its excellent infrared optical and thermoelectric properties, toward reaching the two-dimensional limit. Herein, we realize the black phosphorus-like PbSe (-phase PbSe) monolayer on Au(111) via epitaxial growth, where a characteristic rectangular superlattice of 5 Å × 9 Å corresponding to 1 × 2 reconstruction with respect to the pristine of-phase PbSe is observed by scanning tunneling microscopy. Corresponding density functional theory calculation confirmed the reconstruction and revealed the driven mechanism, the coupling between monolayer PbSe and Au(111) substrate. The metallic feature of differential conductance spectra as well as the transition of the density of states from semiconductor to metal further verified such coupling. As the unique anisotropic structure, our study provides a pathway towards the synthesis of BP-PbSe monolayer. In addition, it builds up an ideal platform for studying fundamental physics and also excellent prospects in PbSe-based device applications.
由于其优异的红外光学和热电性能，硒化铅（PbSe）在基础研究和工业应用中备受关注，有望达到二维极限。在此，我们通过外延生长在Au(111)上实现了类黑磷的PbSe（β相PbSe）单层，通过扫描隧道显微镜观察到一个5 Å × 9 Å的特征矩形超晶格，对应于相对于原始β相PbSe的1 × 2重构。相应的密度泛函理论计算证实了这种重构，并揭示了驱动机制，即单层PbSe与Au(111)衬底之间的耦合。微分电导谱的金属特性以及态密度从半导体到金属的转变进一步验证了这种耦合。作为独特的各向异性结构，我们的研究为合成BP-PbSe单层提供了一条途径。此外，它为研究基础物理搭建了一个理想平台，在基于PbSe的器件应用方面也具有出色的前景。
