Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entanglement in the 1D extended anisotropic Heisenberg model   We present a study of entanglement in the case of the 1D extended anisotropic
Heisenberg model. We investigate two quantum phase transitions (QPTs) within
the previously found ergodicity phase diagram [E. Plekhanov, A. Avella, and F.
Mancini Phys. Rev. B \textbf{74}, 115120 (2006)]. Our calculations are done by
means of the numerically exact Lanczos method at T=0, followed by a finite-size
scaling. As a measure of entanglement we use the concurrence for two spins out
of the system. We conclude from our studies that these QPTs are accompanied by
a qualitative entanglement change.

11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph