学术报告（5月8日）

主持人：钟定永 教授

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摘要：Semiconductor surfaces and ultrathin interfaces exhibit an interesting variety of two-dimensional (2D) quantum matter phases, such as charge density waves, spin density waves, and superconducting condensates. Yet, the electronic properties of these broken symmetry phases are extremely difficult to control due to the inherent difficulty of doping a strictly 2D material without introducing chemical disorder. The solution to this problem would allow access to novel phases of matter, and could open up completely new directions in surface physics and quantum matter research. Here we successfully exploit a modulation doping scheme to uncover, in conjunction with a scanning tunneling microscope tip-assist, a hidden equilibrium phase in a hole-doped bilayer of Sn on Si(111). This new phase is intrinsically phase separated into insulating domains with polar and non-polar symmetries. Its formation involves a spontaneous symmetry breaking process that appears to be electronically driven, notwithstanding the lack of metallicity in this system. This modulation doping approach promises new avenues for exploring competing quantum matter phases on a silicon platform. [F. Ming et al. Nature Communications 8, 14721 (2017)]

报告人简介：2007年在西北大学获得物理学学士学位。2012年在香港中文大学跟随肖旭东教授从事研究工作并获得物理学博士学位。2012年8月至2014年2月期间在香港中文大学从事博士后研究，期间多次访问中国科技大学并进行合作研究。2014年5月至今在美国田纳西大学诺克斯维尔分校从事博士后研究。研究的主要方向在表面实验科学。主要使用扫描隧道显微镜，并结合多种表面结构的手段来研究表面上原子结构的性质。主要的工作在原子操纵，表面原子、团簇的动态过程，表面相变等。在Physical review letter，Physical review B，Nature communications 等国际期刊发表论文10余篇。