Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Soft pair excitations and double-log divergences due to carrier
  interactions in graphene   Interactions between charge carriers in graphene lead to logarithmic
renormalization of observables mimicking the behavior known in
(3+1)-dimensional quantum electrodynamics (QED). Here we analyze soft
electron-hole (e-h) excitations generated as a result of fast charge dynamics,
a direct analog of the signature QED effect - multiple soft photons produced by
the QED vacuum shakeup. We show that such excitations are generated in photon
absorption, when a photogenerated high-energy e-h pair cascades down in energy
and gives rise to multiple soft e-h excitations. This fundamental process is
manifested in a double-log divergence in the emission rate of soft pairs and a
characteristic power-law divergence in their energy spectrum of the form
$\frac{1}{\omega}\ln \left(\frac{\omega}{\Delta}\right) $. Strong
carrier-carrier interactions make pair production a prominent pathway in the
photoexcitation cascade.

37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph