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香港科技大学刘军伟教授：自旋分裂反铁磁体和拓扑超导体中晶体对称性引发的新特性
- 来源：
- 学校官网
- 收录时间：
- 2025-03-17 11:32:17
- 时间：
- 2025-03-03 10:00:00
- 地点：
- 物理楼（18号楼）二楼213室学术报告厅
- 报告人：
- 刘军伟教授
- 学校：
- -/-
- 关键词：
- spin-splitting antiferromagnet,topological superconductor,crystal symmetry,Majorana zero modes,electric readout,Néel order
- 简介：
- I will talk about the novel properties due to crystal symmetry spin-splitting antiferromagnets (AFMs) [Nat. Commun. 12, 2846 (2021)] (named as altermagnet in 2022) and in topological superconductor [Nature 633, 71 (2024)].
- -/- 170
报告介绍：
In spin-splitting AFMs, we propose the crystal-symmetry-paired spin-valley/momentum locking (CSVL/CSML), which is enabled by a crystal symmetry and intrinsically exists in AFMs (e.g., V2Se2O, V2Te2O, MnTe and RuO2) [Nat. Commun. 12, 2846 (2021)]. CSML enables feasible controls of spin in AFMs by manipulating the corresponding crystal symmetry. Typically, one can use a strain field to induce net valley polarization/magnetization and use an electric field to generate a noncollinear spin current even without spin-orbit coupling. All the predictions have been confirmed in experiments [arXiv:2407.19555; arXiv:2408.00320 (both accepted in Nature Physics)]. These properties have helped us realize the electric readout and 180o deterministic switching of the Néel order in our experimental work in Mn5Si3 [Sci. Adv. 10, eadn0479 (2024)] and CrSb [Nature 638, 645–650 (2025)]. In topological superconductors, magnetic mirror symmetry can protect multiple Majorana zero modes (MZMs) in a single vortex, which allows feasible controls of hybridization of MZMs simply using an external field. This has been realized in our recent collaborative experimental works with Prof Jin-Feng Jia’s group [Nature 633, 71 (2024); Quantum Frontiers 3, 20 (2024)]. Similar properties can also be realized in superconducting CSVL/CSML materials.
报告人介绍：
Prof. Junwei Liu obtained his PhD at Tsinghua University in 2014 and then did his postdoctoral research at MIT. He joined HKUST in 2017 as an assistant professor and was promoted to an associate professor in 2023.
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