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Topological Trio

Date and time Oct 02, 2018
from 12:00 PM to 01:00 PM
Location 60 St. George Street, MP 606
Host Joseph Thywissen

Hui Zhai

Institute for Advanced Study, Tsinghua University



In this talk, I will describe three recent works related to topological physics, on the topics of non-equilibrium dynamics, strongly interacting physics, and machine learning, respectively.

Non-Equilibrium Dynamics: Previous studies of topological effects have mostly focused on equilibrium or near-equilibrium situations. We show that the topological invariant can also manifest its physical effect in a quench dynamics far from equilibrium.
Interaction Effect: We utilize the recently proposed Sachdev-Ye-Kitaev model and construct an exactly solvable model to address the interaction effect in a topological band insulator. An interaction-induced topological transition and its critical behaviors can be shown explicitly by this model.
Machine Learning: We show that we can train a neural network to predict accurately a topological invariant from local input, and without human knowledge as a prior. We also analyze the neural network to show that what is captured by the neural network is precisely the mathematical formula for topological invariant.
[1] Ce Wang, Pengfei Zhang, Xin Chen, Jinlong Yu, and Hui Zhai, Phys. Rev. Lett. 118, 185701 (2017)
[2] Pengfei Zhang, Huitao Shen, and Hui Zhai, Phys. Rev. Lett. 120, 066401 (2018)
[3] Pengfei Zhang and Hui Zhai, Phys. Rev. B 97, 201112(R) (2018)



Please note non standard day and location.

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