Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spontaneous spin stripe dimerization in the doped t-J model   To investigate spin dimerization in the t-J model we consider the extended
t-J-\delta model with explicit spin dimerization introduced via parameter
\delta. At zero doping the dimerized spin liquid is unstable at \delta <
\delta_c = 0.3. We demonstrate that the doping stabilizes the dimerized stripe
phase: the \delta_c(x) decreases when doping x increases. At doping larger than
critical, x > x_c, the dimerized phase is stable even without explicit
dimerization, i.e. at \delta=0.

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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga