# Quantum Monte Carlo detection of SU(2) symmetry breaking in the participation entropies of line subsystems

### Submission summary

 As Contributors: David J. Luitz Arxiv Link: https://arxiv.org/abs/1612.06338v2 (pdf) Date accepted: 2017-02-24 Date submitted: 2017-02-22 01:00 Submitted by: Luitz, David J. Submitted to: SciPost Physics Discipline: Physics Subject area: Quantum Physics Approach: Theoretical

### Abstract

Using quantum Monte Carlo simulations, we compute the participation (Shannon-R\'enyi) entropies for groundstate wave functions of Heisenberg antiferromagnets for one-dimensional (line) subsystems of length $L$ embedded in two-dimensional ($L\times L$) square lattices. We also study the line entropy at finite temperature, i.e. of the diagonal elements of the density matrix, for three-dimensional ($L\times L\times L$) cubic lattices. The breaking of SU(2) symmetry is clearly captured by a universal logarithmic scaling term $l_q\ln L$ in the R\'enyi entropies, in good agreement with the recent field-theory results of Misguish, Pasquier and Oshikawa [arXiv:1607.02465]. We also study the dependence of the log prefactor $l_q$ on the R\'enyi index $q$ for which a transition is detected at $q_c\simeq 1$.

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Published as SciPost Phys. 2, 011 (2017)