Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large physical spin approach for strongly correlated electrons   We present a novel approach for a systematic large--spin expansion of the
$t$-$J$ Hamiltonian which enables us to work without the constraint of no
double occupancy. In our scheme we can perform the large--spin limit ensuring
that the low energy spin excitations are in {\em exact} correspondence with the
physical excitations of the $s={1\over2}$ Hilbert space. As a consequence, we
expect a smooth dependence of the physical quantities on the expansion
parameter $1/ s$. As a first application of the method we study the case of a
single hole in a N\'eel background. A systematic expansion in fluctuations
about this stable solution indicates that by increasing $t/J$ the quasiparticle
weight strongly depends on the momentum carried by the hole. Results, obtained
on small lattice sizes, are found in excellent agreement with exact
diagonalization data.

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The categories of this paper are: q-alg
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
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The categories of this paper are: chem-ph
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex