Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Zero Energy States at a Normal--Cuprate-Superconductor Interface Probed
  by Shot Noise   We report measurements of the current noise generated by the optimally doped,
x=0.15, ${\rm Au- La_{2-x}Sr_xCuO_4}$ junctions. For high transmission
junctions on (110) surface, we observed split zero-bias conductance peak
(ZBCP), accompanied by enhanced shot noise. We attribute the enhanced noise to
the Cooper pair transport through the junction. The ZBCP disappears and the
noise decreases to the one expected for the charge $e$ with heating at
temperatures well below ${\rm T_c}$, and at voltages much smaller than the bulk
superconducting gap, setting a new energy scale of 0.5 mV. We attribute this
scale to the existence of an $id_{xy}$ or $is$ order parameter at the sample
surface.

20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph