Emergent Dirac fermions and gauge field in condensed matter systemYin-Chen HePostdoctoral researcherPhysics DepartmentHarvard University

Abstract: Many-body entanglement can lead to exotic phases and phase transitions beyond conventional symmetry eaking paradigm. The prominent examples are the topological ordered phase in the fractional quantum Hall and quantum spin liquid. In this talk, I will go beyond the relatively well understood gapped topological order, and focus on the exotic critical phenomena. Specifically I will discuss the critical theories that have emergent Dirac fermions interacting with a U(1) gauge field. I will show how those theories can emerge as a critical spin liquid phase on the kagome lattice as well as the critical points between different fractional quantum Hall phases. Our discoveries make a idge between the formal field theories with our real world and would also help to understand those theories that puzzle the community for decades.

Bio: 2016.9-present: Gordon and Betty Moore fellowship, Harvard University; 2014.7-2016.8: Postdoc fellow, Max-Planck institute of complex physics system, Dresden, Germany; 2011.9-2014.7 Doctor of physics, Fudan University, Shanghai, China

For more information: https://yinchenhe.wordpress.com

Cette conférence est présentée par le RQMP Versant Nord du Département de physique de l'Université de Montréal et de Génie physique de la Polytechnique.