腾讯会议ID：586-935-205 会议密码：1019

主持人：胡江平 研究员

联系人：傅琦 (fuqi@iphy.ac.cn)

Abstract：

Symmetry guides condensed matter research to seek materials with unusual responses: any response incompatible with crystal symmetry is suppressed. Centrosymmetry, for example, forbids diode-like directional transport. This rule strictly applies to bulk solids, yet mesoscopic geometry can alter the effective symmetry group, enabling bulk-forbidden functionalities. Focused ion beam machining allows precise 3D shaping of single crystals, making shape engineering a powerful tool to tailor quantum materials' electronic properties.

Recent works illustrate this principle. In Kagome superconductor CsV₃Sb₅, mesoscopic confinement produces chiral transport linked to an enigmatic many-body state. For bismuth, strong quantizing magnetic fields push currents to surfaces. Device geometry overrides its native hexagonal symmetry, yielding a 3D quantum Hall effect with circulating edge currents. In inversion-symmetric FeSe superconductor, shape control modulates mesoscopic nematic domains to generate, tune and reverse superconducting diode effects. These cases serve as an example for the emergent paradigm of 3D shape control over electronically active quantum materials.

Brief CV of Prof. Philip J.W. Moll：

Philip Moll is Director of the Microstructured Quantum Matter Department at the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) in Hamburg and Professor at the University of Hamburg. Starting in 2026, he also holds a Distinguished Professorship at Tohoku University, Japan. He studies how crystal geometry changes material physics. His team pioneered focused ion beam machining to fabricate micrometer-scale 3D quantum-material single crystals, using sample shape as an experimental probe. His key findings include hydrodynamic electron flow, strain-tunable superconductivity, topological transport, and magnetically controllable chirality in CsV₃Sb₅. Philip received his PhD from ETH Zurich in 2012. After postdoctoral training at ETH and UC Berkeley, he launched an independent Max Planck group in 2015, worked at EPFL, and took his current Hamburg position in 2022. His accolades include the ETH Medal, ABB Award, Nicholas Kurti Science Prize, WEF Young Scientist and 2025 APS Fellowship. He has two ERC grants and serves on European research advisory panels.

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