Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of novel gapped phases in potassium doped single layer
  p-terphenyl on Au (111)   Recently, superconductivity in potassium (K) doped p-terphenyl (C18H14) has
been suggested by the possible observation of the Meissner effect and
subsequent photoemission spectroscopy measurements, but the detailed lattice
structure and more-direct evidence are still lacking. Here we report a low
temperature scanning tunneling microscopy/spectroscopy (STM/STS) study on
K-doped single layer p-terphenyl films grown on Au (111). We observe several
ordered phases with different morphologies and electronic behaviors, in two of
which a sharp and symmetric low-energy gap of about 11 meV opens below 50 K. In
particular, the gap shows no obvious response to a magnetic field up to 11
Tesla, which would caution against superconductivity as an interpretation in
previous reports of K-doped p-terphenyl materials. Such gapped phases are
rarely (if ever) observed in single layer hydrocarbon molecular crystals. Our
work also paves the way for fabricating doped two-dimensional (2D) hydrocarbon
materials, which will provide a platform to search for novel emergent
phenomena.

35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th