Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Origin of the DC and AC conductivity anisotropy in iron-based
  superconductors: scattering rate versus spectral weight effects   To shed light on the mechanism responsible for the in-plane resistivity
anisotropy in the nematic phase of the iron-based superconductors, we
investigate the impact of spin fluctuations on the anisotropic AC conductivity.
On the one hand, the scattering of electrons off magnetic fluctuations causes
an anisotropic scattering rate. On the other hand, the accompanying Fermi
velocity renormalization contributes to both the plasma frequency and the
scattering rate in antagonistic ways, giving rise to anisotropies in these
quantities that exactly cancel each other in the DC limit. As a result, the
effective scattering rate changes its sign as function of temperature, but the
DC conductivity retains the same sign, in agreement with recent experiments.

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The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
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The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph