Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum correlations in the spin-1/2 Heisenberg XXZ chain with modulated
  Dzyaloshinskii-Moriya interaction   We study a one-dimensional spin-1/2 XXZ Heisenberg model with alternating
Dzyaloshinskii- Moriya interaction, using the numerical Lanczos method.
Recently, the ground state (GS) phase diagram of this model has been
established using the bosonization approach and extensive density matrix
renormalization group computations. Four quantum phases - saturated
ferromagnetic (FM), Luttinger liquid (LL), and two (C1 and C2) gapped phases
with composite structure of GS order, characterized by the coexistence of
long-range alternating dimer, chirality and antiferromagnetic order have been
identified. Here we reexamine the same problem using the exact diagonalization
Lanczos method for chains up to N = 26 sites and explicitly detect positions of
quantum critical points (QCP) by investigating the quantum correlations as the
entanglement and the quantum discord (QD). It is shown that the entanglement
quantified by concurrence and the first derivative of the QD are able to reveal
besides the standard FM QCP also the Berezinskii-Kosterlitz-Thouless (BKT)
phase transition point between the LL and the gapped C1 phase and the Ising
type critical point separating the C1 and C2 phases.

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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin