12月13日 加拿大Perimeter研究所何寅琛研究员学术报告:Field-induced neutral Fermi surface and QCD3 quantum criticalities in Kitaev materials


报告题目: Field-induced neutral Fermi surface and QCD3 quantum criticalities in Kitaev materials
报告人: 何寅琛
报告时间:2018年12月13日 周四 10:00
报告地点:唐仲英楼A213

Abstract:
We perform both numerical and theoretical studies on the phase diagram of the Kitaev materials in the presence of a magnetic field. We find that a new quantum spin liquid state with neutral Fermi surfaces emerges at intermediate field strengths, between the regimes for the non-Abelian chiral spin liquid state and for the trivial polarized state. We also theoretically study the field-induced quantum phase transitions from the non-Abelian chiral spin liquid to the symmetry-broken zigzag phase and to the trivial polarized state. Utilizing the recently developed dualities of gauge theories, we find these transitions can be described by critical bosons or gapless fermions coupled to emergent non-Abelian gauge fields, and the critical theories are of the type of a QCD3-Chern-Simons theory. We propose that all these exotic quantum phase transitions can potentially be direct and continuous in the Kitaev materials, and we present sound evidence for this proposal. Therefore, besides being systems with intriguing quantum magnetism, Kitaev materials may also serve as table-top experimental platforms to study the interesting dynamics of emergent strongly interacting quarks and gluons in 2+1 dimensions.

报告人简介:何寅琛,2008年复旦大学本科,2014年复旦大学博士毕业,2014-2016年在德国马克斯普朗克复杂系统研究所(MPI-PKS)做博士后,2016-2018年在美国哈佛大学做博士后,2018年起在加拿大Perimeter Institute任Junior Faculty(等同于Assistant Professor)。从事凝聚态理论研究,主要研究兴趣为强关联物理,包括自旋液体,奇异量子相变,规范场论,共形场论,分数量子霍尔效应,拓扑相以及强关联计算(DMRG,蒙特卡洛等)。

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