Simulating chiral spin liquids with projected entangled-pair states

Abstract

Doubts have been raised on the representation of chiral spin liquids exhibiting topological order in terms of projected entangled pair states (PEPSs). Here, starting from a simple spin-1/2 chiral frustrated Heisenberg model, we show that a faithful representation of the chiral spin liquid phase is in fact possible in terms of a generic PEPS upon variational optimization. We find a perfectly chiral gapless edge mode and a rapid decay of correlation functions at short distances consistent with a bulk gap, concomitant with a gossamer long-range tail originating from a PEPS bulk-edge correspondence. For increasing bond dimension, (i) the rapid decrease of spurious features -- SU(2) symmetry breaking and long-range tails in correlations -- together with (ii) a faster convergence of the ground state energy as compared to state-of-the-art cylinder matrix-product state simulations involving far more variational parameters, prove the fundamental relevance of the PEPS ansatz for simulating systems with chiral topological order.

8 pages, 6 figures, source code available at https://github.com/jurajHasik/peps-torch

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• Symmetries and boundary theories for chiral Projected Entangled Pair States
• Investigation of the chiral antiferromagnetic Heisenberg model using PEPS
• Variational methods for contracting projected entangled-pair states

Cited by in corpus (3)

• Sequential Adiabatic Generation of Chiral Topological States
• Rainbow chains and numerical renormalisation group for accurate chiral conformal spectra
• Chiral Edge States Emerging on Anyon-Net