通过对称性驱动外延合成的亚稳态五边形二维材料
A Metastable Pentagonal 2D Material Synthesized by Symmetry-Driven Epitaxy
AI总结：
本文通过对称性驱动外延在Pd(100)衬底上成功合成了亚稳态单层五边形PdTe2，实验与理论结合证实其为1.05 eV间接带隙半导体，为五边形二维材料合成与应用开辟了新途径。
摘要：
迄今为止，大多数实验研究的二维（2D）材料以六边形作为其基本构建单元。只有少数例外，如PdSe2，在五边形相中能量更低，并表现出以五边形为基本构建单元。尽管理论已预测了大量五边形二维材料，但其中许多是亚稳态的，其实验实现十分困难。在此，我们报道了通过对称性驱动外延成功合成一种亚稳态五边形二维材料——单层五边形PdTe2。利用扫描隧道显微镜和互补光谱测量对单层五边形PdTe2进行了表征，结果表明其具有有序的低对称性原子排布，并通过与底层Pd(100)衬底的晶格匹配而稳定。理论计算结合角分辨光电子能谱揭示，单层五边形PdTe2是一种带隙为1.05 eV的间接带隙半导体。我们的工作为基于五边形的二维材料的合成开辟了一条途径，并为探索其在多功能纳米电子学等领域的应用提供了机会。
英文摘要：
Most two-dimensional (2D) materials experimentally studied so far have hexagons as their building blocks. Only a few exceptions, such as PdSe2, are lower in energy in pentagonal phases and exhibit pentagons as building blocks. While theory has predicted a large number of pentagonal 2D materials, many of them are metastable and their experimental realization is difficult. Here we report the successful synthesis of a metastable pentagonal 2D material, the monolayer pentagonal PdTe2, by symmetry-driven epitaxy. Scanning tunneling microscopy and complementary spectroscopy measurements are used to characterize the monolayer pentagonal PdTe2, which demonstrates well-ordered low-symmetry atomic arrangements and is stabilized by lattice matching with the underlying Pd(100) substrate. Theoretical calculations, along with angle-resolved photoemission spectroscopy, reveal monolayer pentagonal PdTe2 is a semiconductor with an indirect bandgap of 1.05 eV. Our work opens an avenue for the synthesis of pentagon-based 2D materials and gives opportunities to explore their applications such as multifunctional nanoelectronics.
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