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学术预告:虞跃教授谈“Anomalous magnetic transport and extra quantum oscillation in semi-metallic photon-like fermion gas”

作者:理学院   点击:2  发布时间:2018-11-22 09:39:25
地点:杭州师范大学仓前校区勤园20-518会议室
时间:2018年11月23日(周五)下午1:00-2:00

报告摘要:

In the absence of Lorentz symmetry, the pseudospin-1 counterpart of the Weyl fermion (feroton) with linear dispersions and an exact flat band can emerge in condensed matter systems. The flat band branch of the feroton is equivalent to the longitudinal photon in Maxwell theory, which is a redundant degree of freedom due to the emergent (fermionic) gauge symmetry. Upon coupling to an external magnetic field, the fermionic gauge symmetry is broken and the flat band ferotons become gapless excitations characterized by Landau level indices (n> 1). In the long wavelength limit, these gapless modes are of the opposite chirality to the chiral anomaly related zero Landau level, which leads to much more plentiful magnetic transport properties. To further explore the novel properties of these gapless modes, we investigate the quantum oscillation through a generalized Lieb lattice model. We find an extra oscillating behavior which indicates the existence of these exotic gapless modes. We collect known ab initio calculation data from the literature and discuss the possibility of realizing the semi-metallic feroton gas in real materials.

报告人简介

   1982年浙江大学物理系本科毕业,1987年11月在浙江大学获博士学位,1987年至1992年在中国科学院高能物理研究所、理论物理研究所做博士后,1992年起任中国科学院理论物理研究所副研究员、研究院,曾任理论物理研究所副所长,2012年起任复旦大学特聘教授。1999年获香港求是杰出青年学者奖、1998年全国博士后“国氏”奖、2001年获得国家杰出青年基金资助、2005年获全国优秀博士后称号。 虞跃教授的研究领域是凝聚态物理理论和量子场论,主要从事凝聚态强关联低维多体系统的研究,其中包括分数量子霍尔效应,拓扑物态,量子分数统计和拓扑量子计算,高能物理系统和严格可解数学物理模型在冷原子系统中的量子模拟等, 共发表论文100余篇。