Spin-resolved entanglement spectroscopy of critical spin chains and Luttinger liquids

DOI10.1088/1742-5468/2014/11/P11013zbMATH Open1456.81080arXiv1407.3779OpenAlexW1986161853MaRDI QIDQ3301796

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Publication date: 11 August 2020

Published in: (Search for Journal in Brave)

Abstract: Quantum critical chains are well described and understood by virtue of conformal field theory. Still the meaning of the real space entanglement spectrum -- the eigenvalues of the reduced density matrix -- of such systems remains in general elusive, even when there is an additional quantum number available such as spin or particle number. In this paper we explore in details the properties and the structure of the reduced density matrix of critical XXZ spin-$frac12$ chains. We investigate the quantum/thermal correspondence between the reduced density matrix of a $T=0$ pure quantum state and the thermal density matrix of an effective entanglement Hamiltonian. Using large scale DMRG and QMC simulations, we investigate the conformal structure of the spectra, the entanglement Hamiltonian and temperature. We then introduce the notion of spin-resolved entanglement entropies which display interesting scaling features.

Full work available at URL: https://arxiv.org/abs/1407.3779

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