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

by David J. Luitz, Nicolas Laflorencie

Submission summary

As Contributors:	David J. Luitz
Arxiv Link:	https://arxiv.org/abs/1612.06338v2
Date accepted:	2017-02-24
Date submitted:	2017-02-22
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)

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