Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic properties of air-sensitive nanomaterials probed with
  microwave impedance measurements   Characterization of electronic properties of novel materials is of great
importance for exploratory materials development and also for the discovery of
new correlated phases. As several novel compounds are available in powder form
only, contactless methods, which also work on air sensitive samples, are higly
desired. We present that the microwave cavity perturbation technique is a
versatile tool to study conductivity in such systems. The examples include
studies on semiconducting-metallic crossover in carbon nanotubes upon alkali
doping, study of vortex motion in the K$_3$C$_{60}$ superconductor, and the
characterization of various alkali atom doped phases of black phosphorus.

13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys