Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A theory of the quantum spin liquid in the hyper-honeycomb metal-organic
  framework [(C$_2$H$_5$)$_3$NH]$_2$Cu$_2$(C$_2$O$_4$)$_3$ from first
  principles   We construct a tight-binding model of
[(C$_2$H$_5$)$_3$NH]$_2$Cu$_2$(C$_2$O$_4$)$_3$ from Wannier orbital overlaps.
Including interactions within the Jahn-Teller distorted Cu-centered $e_g$
Wannier orbitals leads to an effective Heisenberg model. The hyper-honeycomb
lattice contains two symmetry distinct sublattices of Cu atoms arranged in
coupled chains. One sublattice is strongly dimerized, the other forms isotropic
antiferromagnetic chains. Integrating out the strongest (intradimer) exchange
interactions leaves extremely weakly coupled Heisenberg chains, consistent with
the observed low temperature physics.

23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat