Nonclassicality and criticality in symmetry protected magnetic phases

Matthew J. M. Power, Steve Campbell, Maria Moreno-Cardoner, Gabriele De Chiara

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9 Citations (Scopus)
193 Downloads (Pure)

Abstract

Quantum and global discord in a spin-1 Heisenberg chain subject to single-ion anisotropy (uniaxial field) are studied using exact diagonalisation and the density matrix renormalisation group (DMRG). We find that these measures of quantum non-classicality are able to detect the quantum phase transitions confining the symmetry protected Haldane phase and show critical scaling with universal exponents. Moreover, in the case of thermal states, we find that quantum discord can increase with increasing temperature.
Original languageEnglish
Article number214411
Number of pages7
JournalPhysical Review B (Condensed Matter)
Volume91
Issue number21
DOIs
Publication statusPublished - 08 Jun 2015

Keywords

  • quant-ph
  • cond-mat.str-el

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