Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low frequency Raman response near Ising-nematic quantum critical point:
  a memory matrix approach   Recent Raman scattering experiments have revealed a "quasi-elastic peak" in
$\mathrm{FeSe_{1-x}S_x}$ near an Ising-nematic quantum critical point (QCP)
\cite{zhang17}. Notably, the peak occurs at sub-temperature frequencies, and
softens as $T^{\alpha}$ when temperature is decreased toward the QCP, with
$\alpha>1$. In this work, we present a theoretical analysis of the
low-frequency Raman response using a memory matrix approach. We show that such
a quasi-elastic peak is associated with the relaxation of an Ising-nematic
deformation of the Fermi surface. Specifically, we find that the peak frequency
is proportional to $ \tau^{-1}\chi^{-1}$, where $\chi$ is the Ising-nematic
thermodynamic susceptibility, and $\tau^{-1}$ is the decay rate of the nematic
deformation due to an interplay between impurity scattering and
electron-electron scattering mediated by critical Ising-nematic fluctuations.
We argue that the critical fluctuations play a crucial role in determining the
observed temperature dependence of the frequency of the quasi-elastic peak. At
frequencies larger than the temperature, we find that the Raman response is
proportional to $\omega^{1/3}$, consistently with earlier predictions
\cite{klein18a}.

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The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
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The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph