Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of metallic electronic structure in a single-atomic-layer
  oxide   Correlated electrons in transition metal oxides (TMOs) exhibit a variety of
emergent phases. When TMOs are confined to a single-atomic-layer thickness,
experiments so far have shown that they usually lose diverse properties and
become insulators. In an attempt to extend the range of electronic phases of
the single-atomic-layer oxide, we search for a metallic phase in a
monolayer-thick epitaxial SrRuO$_3$ film. Combining atomic-scale epitaxy and
angle-resolved photoemission measurements, we show that the monolayer SrRuO$_3$
is a strongly correlated metal. Systematic investigation reveals that the
interplay between dimensionality and electronic correlation makes the monolayer
SrRuO$_3$ an incoherent metal with orbital-selective correlation. Furthermore,
the unique electronic phase of the monolayer SrRuO$_3$ is found to be highly
tunable, as charge modulation demonstrates an incoherent-to-coherent crossover
of the two-dimensional metal. Our work emphasizes the potentially rich phases
of single-atomic-layer oxides and provides a guide to the manipulation of their
two-dimensional correlated electron systems.

7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph