Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Eigenstate thermalization in the two-dimensional transverse field Ising
  model   We study the onset of eigenstate thermalization in the two-dimensional
transverse field Ising model (2D-TFIM) in the square lattice. We consider two
non-equivalent Hamiltonians: the ferromagnetic 2D-TFIM and the
antiferromagnetic 2D-TFIM in the presence of a uniform longitudinal field. We
use full exact diagonalization to examine the behavior of quantum chaos
indicators and of the diagonal matrix elements of operators of interest in the
eigenstates of the Hamiltonian. A finite size scaling analysis reveals that
quantum chaos and eigenstate thermalization occur in those systems whenever the
fields are nonvanishing and not too large.

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The categories of this paper are: econ
3
The categories of this paper are: physics
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
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The categories of this paper are: eess
34
The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas