Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photon-induced switching and tunneling phenomna in a YBCO thin film
  junction   In the persistent photoconductivity (PPC) phenomenon, illumination of a YBCO
thin film junction with a 1mW He-Ne laser leads to the decrease of the critical
critical voltage (similar to the threshold voltage). The decrease of the
critical votage was reversed by illumination with incadenscent light. The
critical voltage across the junction was experimentally decreased and increased
by alternating illumination between He-Ne laser and incandescent light. We also
observed visible quenching of the photo-induced state using a 5mW He-Ne laser.
Finally, the threshold behavior of the junction was destroyed by illuminating
it with incadenscent light.

8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs