Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Tight-Binding Investigation of the NaxCoO2 Fermi Surface   We perform an orthogonal basis tight binding fit to an LAPW calculation of
paramagnetic Na$_x$CoO$_2$ for several dopings. The optimal position of the
apical oxygen at each doping is resolved, revealing a non-trivial dependence of
the band structure and Fermi surface on oxygen height. We find that the small
e$_{g'}$ hole pockets are preserved throughout all investigated dopings and
discuss some possible reasons for the lack of experimental evidence for these
Fermi sheets.

15
The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: cs
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph