Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-reversal symmetry breaking surface states in t-J model   Recently a phenomenological Ginzburg-Landau (GL) theory has been proposed to
describe the occurrence of a locally time-reversal symmetry (T) breaking state
near a Josephson junction between unconventional superconductors. In this paper
we derive this type of GL free energy microscopically from the t-J model within
a slave-boson mean-field approximation. The resulting GL free energy is shown
to satisfy the conditions to have a T-violating surface state. The existence of
this junction state may explain some of the recent experiments on High-Tc
superconductors.

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The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: eess
6
The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph