Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single-electron counting spectroscopy: simulation study of porphyrin in
  a molecular junction   Electron counting of a single porphyrin molecule between two electrodes shows
a crossover from sub- to super-Poissonian statistics as the bias voltage is
scanned. This is attributed to the simultaneous activation of states with
electron transfer rates spanning several orders of magnitude. Time-series
analysis of consecutive single electron transfer events reveals fast and slow
transport channels, which are not resolved by the average current alone.

10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th