时间：5月26日（周二） 上午11:10-12:00

地点：勤园20-516

报告摘要：

Water is fundamental to life, yet as a many-body quantum system with a complex hydrogen-bond network and strong nuclear quantum effects, it still poses many open questions. Recently, we developed hydrogen-sensitive scanning probe microscopy (SPM) based on higher-order electrostatic forces1, successfully applying it to interfacial water/ice systems. We begin from 3D bulk hexagonal ice (ice Ih) and its surfaces. By developing a universal high-resolution imaging method for insulating surfaces, we are able to directly image ice Ih surfaces at the atomic scale2. These measurements reveal unique superstructures and premelting phenomena at the ice surface. By lowering the dimensionality, we then identify an intrinsic 2D ice I phase3, an interlocked double bilayer, stabilized on weakly interacting substrates such as Au(111), graphene, and hBN. By ion doping, we can also stabilize and control a variety of more complex and intriguing ice phases4,5. Finally, we address how ice evolves from disordered to ordered states, both in the oxygen skeleton and in the coherently ordered proton subsystem. These findings offer new insights into phase behavior and physicochemical properties of ice, providing a deeper understanding of its fundamental nature and potential applications in materials science.

报告人简介：

洪嘉妮，北京大学换妻 量子材料科学中心特聘研究员。基于自主研发并实现国产化的 qPlus 型扫描探针显微镜（qPlus-SPM），建立了一套普适适用于绝缘体表面的非侵扰式原子级分辨成像技术。围绕“表界面水/冰体系的微观结构与物性”这一关键科学问题，系统开展研究并取得多项突破性成果。截至目前，以第一作者/共一作者/共同通讯作者在 Nature、Science、Nature Nanotechnology、Physical Review X 等期刊发表论文 5 篇，相关研究成果入选 2024 年中国重大技术进展。入选国家“万人计划”青年拔尖人才（2025）、博士后创新人才支持计划（2023）；主持博士后科学基金面上项目 1 项，作为骨干成员参与国家重大研究计划和国家重点研发计划，获博士后科研业绩评估一档资助。曾获 Eigler Prize finalist（STM 2025，唯一中国入选者）、Gordon Research Conference on Water and Aqueous Solutions Best Poster Award（2024，唯一中国获奖者）、北京大学优秀博士后等荣誉。