Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phases of Mott-Hubbard bilayers   A phase diagram of two Mott-Hubbard planes interacting with a short-range
Coulomb repulsion is presented. Considering the case of equal amount of doping
by holes in one layer as electrons in the other, a holon-doublon inter-layer
exciton formation is shown to be a natural consequence of Coulomb attraction.
Quasiparticle spectrum is gapped and incoherent below a critical doping
$\delta_c$ due to the formation of excitons. A spin liquid insulator (SLI)
phase is thus realized without the lattice frustration. The critical value
$\delta_{c}$ sensitively depends on the inter-layer interaction strength. In
the $tJ$ model description of each layer with the d-wave pairing, $\delta_{c}$
marks the crossover between SLI and d-wave superconductor. The SLI phase,
despite being non-superconducting and charge-gapped, still shows
electromagnetic response similar to that of a superfluid due to the exciton
transport. Including antiferromagnetic order in the $tJ$ model introduces
magnetically ordered phases at low doping and pushes the spin liquid phase to a
larger inter-layer interaction strength and higher doping concentrations.

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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
1
The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: physics
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: comp-gas