Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Negative-Temperature State Formed and Interactions Inverted by Symmetric
  Monocycle Optical Pulse Excitation   The excited state dynamics of correlated electron and electron-phonon systems
triggered by an oscillating electric-field pulse of large amplitude are
theoretically investigated. A "negative-temperature" state and inversion of
electron-electron and electron-phonon interactions are induced even by a
symmetric monocycle pulse. This fact is numerically demonstrated, using the
exact diagonalization method, in a band-insulator phase of one-dimensional
three-quarter-filled strongly dimerized extended Peierls-Hubbard and Holstein
models. When the total-energy increment is maximized as a function of the
electric field amplitude, the occupancy of the bonding and antibonding orbitals
is inverted to produce a negative-temperature state. Around this state, the
dependences of time-averaged electron-electron and electron-phonon correlation
functions on interaction parameters are opposite to those in the ground state.

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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an