Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Impurity Quantum Phase Transition in a Current-Carrying d-Wave
  Superconductor   We study an Anderson impurity embedded in a d-wave superconductor carrying a
supercurrent. The low-energy impurity behavior is investigated by using the
numerical renormalization group method developed for arbitrary electronic bath
spectra. The results explicitly show that the local impurity state is
completely screened upon the non-zero current intensity. The impurity quantum
criticality is in accordance with the well-known Kosterlitz-Thouless
transition.

19
The categories of this paper are: eess
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin