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Monday, July 29, 2019
3:00 PM - 4:00 PM
East Bridge 114

IQIM Postdoctoral and Graduate Student Seminar

Universality classes of topological phase transitions
Wei Chen, Department of Physics, PUC - Rio,

Note: Special time 3:00 on Monday, July 29

Abstract:

In topological insulators and topological superconductors, the change of topological invariant caused by tuning a certain parameter signifies a topological phase transition. Based on the fact that the topological invariant is generally an integration of local curvature in momentum space, we propose a paradigm to characterize the topological phase transitions according to the divergence of the local curvature. The paradigm introduces the notion of correlation function, critical exponents, scaling laws, and renormalization group, applicable to either noninteracting, interacting, or Floquet systems. The notion of universality class and its relation with the symmetry classification will be elaborated. Moreover, we will use machine learning scheme to elaborate that the information about topological phase transitions is entirely encoded in the divergence of the local curvature.

For more information, please contact Marcia Brown by phone at 626-395-4013 or by email at marciab@caltech.edu.