ISSP - The institute for Solid State Physics

Seminar
文字のサイズ: (小) / (中) / (大)
[理論インフォーマルセミナー]
Symmetric tensor networks and topological phases
日程 : 2018年2月16日(金) 16:00 - 17:00 場所 : 物性研究所本館6階 第5セミナー室 (A615) 講師 : Ying Ran 所属 : Boston College and ISSP 世話人 : 押川正毅 (63275)
e-mail: oshikawa@issp.u-tokyo.ac.jp

I will describe a theoretical framework to systematically classify and construct generic tensor-network wavefunctions (in d=1,2,3 spatial dimensions) respecting both onsite and spatial symmetries, which turns out to be directly related to topological phases and useful from both conceptual and practical points of view. For example, on the conceptual side, this framework allows us to (partially) classify general symmetry protected topological phases involving spatial symmetries, and to prove a generalized Lieb-Schultz-Mattis theorem involving general magnetic translations. We also identify a generic connection between SPT phases and rather conventional symmetry enriched topological (SET) phases via an anyon condensation mechanism, which may serve as a guideline to search for SPT phases in realistic models. On the practical side, the constructed generic tensor-network wavefunctions are useful for variational numerical simulations.

[References: arXiv:1505.03171, 1509.04358, 1610.02024, 1611.07652, 1705.05421]
(公開日: 2018年02月07日)