Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quasiparticle relaxation dynamics in Hg-1223 studied by femtosecond
  time-resolved optical spectroscopy   Following recent progress in understanding the relaxation dynamics of
photoexcited carriers in materials exhibiting a small gap in the low-energy
excitation spectrum we have performed pump-probe measurements on near optimally
doped Hg-1223. We show that the behavior is very similar as in optimally-doped
YBCO, where the data can be interpreted with the coexisting presence of two
energy gaps: normal state T-independent pseudogap and a mean-field-like
collective gap, associated with intrinsic spatially inhomogeneous ground state.
An important difference between the two compounds is found in the low
temperature relaxation time, which in Hg-1223 is found to be strongly
temperature and photoexcitation intensity dependent.

8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex