Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbital polaron in double exchange ferromagnets   We investigate the spectral properties of the two-orbital Hubbard model,
including the double hopping term, by means of the dynamical mean field method.
This Hamiltonian describes materials in which ferromagnetism is realized by the
double exchange mechanism, like for instance manganites, nickelates or diluted
magnetic semiconductors. The spectral function of the unoccupied states is
characterized by a specific equidistant three peak structure. We emphasize the
importance of the double hopping term on the spectral properties. We show the
existence of a ferromagnetic phase due to electron doping near n=1 by the
double exchange mechanism. A quasi-particle excitation at the Fermi energy is
found that we attribute to what we will call an orbital polaron. We derive an
effective spin-pseudospin Hamiltonian for the two-orbital double exchange model
at n=1 filling to explain the existence and dynamics of this quasi-particle.

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The categories of this paper are: math-ph
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con