Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gobal entanglement and double occupancy in many-electron states   The entanglement in many-electron states is investigated using a global
entanglement measure, viz. average site mixedness. We have examined metallic
states of noninteracting electrons, Nagaoka and Gutzwiller states of
strongly-correlated electrons, and superconducting states. Uncorrelated
metallic states at half filling seem to maximize entanglement, as these states
optimize the number of holes, the number of doubly-occupied sites. Entanglement
is calculated explicitly for Gutzwiller-projected many-electron states in one
dimension, which have less entanglement as double occupancy is inhibited in
these states. Entanglement in superconducting states, which tend to promote
double occupancy, is calculated as a function of the energy gap, and found to
be lower than the metallic state entanglement. There is a possibility of a
regime with a nonzero single-site concurrence depending on the energy gap.

11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph