Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Automated fabrication technique of gold tips for use in point-contact
  spectroscopy   For a successful point-contact spectroscopy (PCS) measurement, metallic tips
of proper shape and smoothness are essential to ensure the ballistic nature of
a point-contact junction. Until recently, the fabrication of Au tips suitable
for use in point-contact spectroscopy has remained more of an art involving a
trial and error method rather than an automated scientific process. To address
these issues, we have developed a technique with which one can prepare high
quality Au tips reproducibly and systematically. It involves an electronic
control of the driving voltages used for an electrochemical etching of a gold
wire in an HCl-glycerol mixture or an HCl solution. We find that a stopping
current, below which the circuit is set to shut off, is a single very important
parameter to produce an Au tip of desired shape. We present detailed
descriptions for a two-step etching process for Au tips and also test results
from PCS measurements using them.

1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex