Abstract：Nonsymmorphic magnetic Weyl semimetal materials such as ReAlX (Re=rare earth, X=Si/Ge) provide a unique opportunity to explore the correlated phenomena between Weyl semimetals and nontrivial magnetic configurations. To be specific, we study a lattice model in which the magnetic configuration is determined by the competition among ferromagnetic (FM) interaction, the Dzyaloshinsky-Moriya interaction, and the Kondo coupling K0 to the Weyl fermion. Both quantum and finite-temperature phase transitions between FM and correlated nesting helical configurations are found. Different from the uncorrelated helimagnet that decouples to the Weyl fermion, this correlated helimagnet induces a magnetic Brillouin zone with a K0-dependent nesting in the band structure of the conduction electrons instead of the monopole-like Weyl cone. By measuring the current induced by the chiral magnetic effect on the conduction electron with nesting Weyl nodes, one can distinguish the correlated nesting helical order and the ferromagnetism because the chiral magnetic effect is considerably suppressed in the former case. These properties we find here may explain the experimental observations in ReAlX.

报告人简介：虞跃，1982年大学毕业于浙江大学物理系。1987年在浙江大学获理论物理博士学位。1987年底至1992年6月在中国科学院高能物理所和理论物理所做博士后。 1992年至2013年任中国科学院理论物理所副研究员、研究员，期间曾在英国Warwick大学、美国Utah大学和Delaware大学作较长期访问。2013年至今为复旦大学物理系教授, 现任复旦大学场论和粒子理论中心主任。曾任中国科学院理论物理研究所副所长，获香港求是基金会青年科学家奖, 2000年获国家杰出青年基金资助。主要从事凝聚态强关联理论和拓扑物态理论研究，例如，分数量子霍尔效应、强关联电子系统、分数排斥统计、超对称性的量子模拟、Rarita-Schiwinger semimetal和普适拓扑量子计算等。