Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge and Spin Quantum Fluids Generated by Many-Electron Interactions   In this paper we describe the electrons of the 1D Hubbard model by a fluid of
unpaired rotated electrons and a fluid of zero-spin rotated-electron pairs. The
rotated electrons are related to the original electrons by a mere unitary
transformation. For all finite values of energy and for the whole parameter
space of the model this two-fluid picture leads to a description of the energy
eigenstates in terms of occupancy configurations of $\eta$-spin 1/2 holons,
spin 1/2 spinons, and $c$ pseudoparticles only. The electronic degrees of
freedom couple to external charge (and spin) probes through the holons and $c$
pseudoparticles (and spinons). Our results refer to very large values of the
number of lattice sites $N_a$. The holon (and spinon) charge (and spin
transport is made by $2\nu$-holon (and $2\nu$-spinon) composite pseudoparticles
such that $\nu=1,2,...$.

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The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph