Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Absence of spin liquid in non-frustrated correlated systems   The question of the existence of a spin liquid state in the half-filled
Hubbard model on the honeycomb (aka graphene) lattice is revisited. The
Variational Cluster Approximation (VCA), the Cluster Dynamical Mean Field
Theory (CDMFT) and the Cluster Dynamical Impurity Approximation (CDIA) are
applied to various cluster systems. Assuming that the spin liquid phase
coincides with the Mott insulating phase in this non-frustrated system, we find
that the Mott transition is pre-empted by a magnetic transition occuring at a
lower value of the interaction $U$, and therefore the spin liquid phase does
not occur. This conclusion is obtained using clusters with two bath orbitals
connected to each boundary cluster site. We argue that using a single bath
orbital per boundary site is insufficient and leads to the erroneous conclusion
that the system is gapped for all nonzero values of $U$.

21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs