Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Holographic Polarons, the Metal-Insulator Transition and Massive Gravity   Massive gravity is holographically dual to `realistic' materials with
momentum relaxation. The dual graviton potential encodes the phonon dynamics
and it allows for a much broader diversity than considered so far. We construct
a simple family of isotropic and homogeneous materials that exhibit an
interaction-driven Metal-Insulator transition. The transition is triggered by
the formation of polarons -- phonon-electron quasi-bound states that dominate
the conductivities, shifting the spectral weight above a mass gap. We
characterize the polaron gap, width and dispersion.

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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
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The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph