Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: DC Current Generation and Power Feature in Strongly Driven Floquet-Bloch
  Systems   We study the DC current generation in a periodically driven Bloch system
connected to a heat bath. Under a relaxation time approximation, the density
matrix for such a system is obtained, which is related to two equilibria: a
Floquet quasi-equilibrium where the density matrix is diagonal under the
Floquet-Bloch eigenbasis and an instantaneous Bloch thermal equilibrium. Then,
the current responses and their power features, i.e. the power input behavior,
are discussed in a unified manner, which reveals that there exist an intrinsic
current and an extrinsic correction. Remarkably, the intrinsic part consumes no
energy and corresponds to the Floquet quasi-equilibrium, while the extrinsic
part needs a sustained energy input and originates from a shift between two
equilibrium ensembles. We further investigate the role of the external driving
field strength finding that large DC currents can be generated under a
relatively strong but not too strong driving field.

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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga