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Investigation of quantum spin liquids with symmetric PEPS

Date : Friday, October 2nd, 2020 4:00 pm 〜 Place : On Zoom (Please make a registration through the link below) Lecturer : Dr. Ji-Yao Chen Affiliation : Max-Planck-Institute of Quantum Optics Committee Chair : Naoki Kawashima (63260)
e-mail: kawashima@issp.u-tokyo.ac.jp

Quantum spin liquid state can be represented and efficiently characterized within the symmetric Projected Entangled Pair State (PEPS) framework. A prototypical example is the nearest neighbor (NN) resonating valence bond (RVB) state, which has been thoroughly studied on various lattices with PEPS. Here I will show, through suitable deformation of the local tensor of NN RVB state on square lattice, we can introduce long-range singlets into the wave function and drive the state into a topological Z_2 phase. This approach turns out to be quite general for quantum spin liquid problem, which I will briefly explain. Then I will present our recent work about SU(3) chiral spin liquid using this approach, where characteristic feature of SU(3)_1 chiral topological order is observed from PEPS entanglement spectrum.

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(Published on: Friday September 25th, 2020)